CN102649114A - Electrochemical corrosion resistance method for metal - Google Patents
Electrochemical corrosion resistance method for metal Download PDFInfo
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- CN102649114A CN102649114A CN201110054081XA CN201110054081A CN102649114A CN 102649114 A CN102649114 A CN 102649114A CN 201110054081X A CN201110054081X A CN 201110054081XA CN 201110054081 A CN201110054081 A CN 201110054081A CN 102649114 A CN102649114 A CN 102649114A
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- metal
- protective layer
- rigidity
- temperature
- curing agent
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- 239000002184 metal Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title abstract description 13
- 238000006056 electrooxidation reaction Methods 0.000 title abstract description 8
- 239000011241 protective layer Substances 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
- 229920002396 Polyurea Polymers 0.000 claims abstract description 36
- 229920005989 resin Polymers 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 20
- 150000001412 amines Chemical class 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims description 13
- 239000003518 caustics Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000003973 paint Substances 0.000 claims description 5
- 230000037452 priming Effects 0.000 claims description 4
- 239000012945 sealing adhesive Substances 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 11
- 230000007797 corrosion Effects 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 3
- 230000000704 physical effect Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 22
- 239000011248 coating agent Substances 0.000 description 20
- 239000000853 adhesive Substances 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 8
- 230000003628 erosive effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000004210 cathodic protection Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008485 antagonism Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a method for resisting electrochemical corrosion applied to metal, which uses a resin main agent with the purity of amine more than 99 percent and a hardening agent with the NCO value more than 15, and mixes the main agent and the hardening agent in a ratio of 1: 1 by a high-pressure high-temperature airless sprayer, and uses the temperature of 65-75 ℃ and the temperature of 2000-3000psi (lb/in)2) The pressure is sprayed on the surface of a metal, so that a rigid polyurea protective layer is formed on the surface of the metal, the protective layer is the rigid polyurea protective layer and has the advantages of 3-5 seconds of quick curing, water insensitivity, 100 percent of solid content, excellent physical properties and the like, the metal can be protected from the corrosion of chemical corrosion and electrochemical corrosion, the service life of the metal is prolonged, and the advantages of simplicity in construction, short construction period and the like are achieved.
Description
Technical field
The present invention relates to the field of the anti-corrosion treatment of metal surface, especially relate to a kind of electrochemically resistant that is applied to metal and learn corroding method.
Background of invention and prior art
Metal erosion mainly is divided into two kinds of chemical attack and electrochemical corrosion, and the metal erosion meeting causes metal structure to damage, and reduces the intensity of metal, and produces dangerously, and how reducing or delaying metal erosion is the important issue in the industry.
The method that is most commonly used at present prevent metal erosion is for forming a rigidity polyureas protective layer on metallic surface; Form fine and close isolation layer by this rigidity polyureas protective layer in metallic surface; The element that corrosion process capable of blocking is required; Like water, oxygen and extraneous stray electrical current or the like, and then reach the purpose that the metal electrochemically resistant is learned corrosion.
The raw material of rigidity polyureas protective layer mainly contains as the curing agent of A agent and resin as the B agent, and A agent and B agent are imported the interior muzzle of a high pressure-temperature airless sprayer simultaneously and mixed and be sprayed into this metallic surface again, and snap cure promptly forms this rigidity polyureas protective layer.
Resin commonly used is gone up in industry at present has epoxy, PU (polyamine fat), pressure gram (acrylic acid) or the like; And curing agent from the earliest TDI, develop into MDI to up-to-date HDI or the like; Different resin materials mixes different curing agents and has different physical property; If with PU, it has problems such as hydrolysising aging, heat ageing, UV wear out, and the above-mentioned resin material of commonly using is all the elastomer prescription; Its poor adhesive force, water permeability are big, so need high thickness could satisfy the demand that electrochemically resistant is learned corrosion on the engineering.
According to standard, coating must reach following detection standard could satisfy the demand that electrochemically resistant is learned corrosion.
The first does
Adhesive force (Adhesion), SGS testing agency is more than the 105kgf/cm2 according to ASTM D4541 standard criterion detected value.Adhesive force of coatings has been considered to a coating good index in service life, to reach the adhesive force of prevention corrosion, and It is generally accepted must be at 1000psi (70kgf/cm2), and adhesive force of coatings is also long more bigger its service life.Coating has the ability of opposing electrochemical corrosion and the effect that splendid anti-the moon is peeled off if any the above adhesive force of 1500psi (105kgf/cm2) for metallic surface.
Second
Be cathodic disbonding (Cathodic Disbondment), SGS testing agency is the cathodic disbonding of 2mm (radius) according to ASTM G95 standard criterion (28 days 1.5v) detected value.Cathodic disbonding is wherein a kind of application and the liner measurement pattern under cutting, and experience shows on the engineering, and the anti-cathodic disbonding property of application and liner is high more, and it is also long more that coating corrosion-resistant forced with the life-span more.
The 3rd does
Dielectric strength (Dielectric strength), ASTM D149 standard criterion detected value is: run through intensity 20.79kv/mm. disintegration voltage 40.33kv.In the application application, cathodic protection must need good dielectric strength, and cathodic protection potential and electric current will not influence the ability as the corrosion protection barrier like this.The coating of cathodic protection has good insulating properties can let electric current, voltage can not influence coating, just can reach corrosion-resisting function.If the coating of low insulation property is not high because of insulating properties, electric current through the time can be below coating or the surface produce cathodic deposition coating lost efficacy, coating surface can produce metal dust.
The 4th does
Volume impedance (Volume Resistivity), it is 6.527 * 1017/ohm.cm according to ASTM D257 standard criterion detected value surface impedance that surface impedance (Surface resistivity) SGS detects unit, the volume resistance value is 1.342 * 1018/ohm.cm.Coating needs the ability cathodic disbonding; Cathodic protection pay attention to especially coating in the metal base junction (welding bead) want to bear stronger electric shock, though the effect of cathodic disbonding does not have coating can continue to accept to shock by electricity and does not produce and peel off always; But experience shows; The good more impedance strength of the anti-cathodic disbonding property of application and liner is high more, and the corrosion resistance of coating is then better, and service life is also long more.Volume impedance and surface impedance be detect coating lining impedance strength more then table be that the coating insulation degree is higher.
The 5th does
Water absorptivity (Water absorption), vapor permeability (Water vapor Rmeability), SGS testing agency is according to ASTM D570 standard criterion detected value, and the water absorptivity is 0.96%; According to ASTM D1653 standard criterion detected value vapor permeability is 0.196g/hm2.Because the field that application is used, the application lining also is very important for the moisture-resistant impervious, and the base material application is inner to produce loss of adhesion or reduce dielectric strength because the moisture increase can make, and influences coating service life.
The 6th does
Salt spray test (Salt spray)SGS testing agency also was the measurement pattern of a kind of testing coating tolerance under cutting for no foaming salt spray test in 3000 hours according to ASTM B117 standard criterion detected value; Though its result is so obvious not as the test of cathodic disbonding, the result of conclusion and cathodic disbonding is similar.
Again in order to strengthen adhesive force; Present rigidity polyureas protective layer; Generally all have priming paint, structures such as lacquer, three layers of finish paints midway, the material of its use is different, and the thickness of once spraying has restriction; Thereby operational procedure is complicated and need repeatedly spraying and the engineering time long, difficult quality satisfies the demand in the use.
Summary of the invention
Main purpose of the present invention is to provide a kind of electrochemically resistant of metal to learn caustic solution, can overcome the deficiency of prior art; Adopt this method to simplify working process; Reduction of erection time; After this method is handled, can produce the rigidity polyureas protective layer of a tool high adhesion force, anti-cathodic disbonding, anti-dielectric and volume impedance etc. in the metal surface, with the generation of protection metal and antagonism electrochemical corrosion.
For achieving the above object; The present invention provides a kind of electrochemically resistant that is applied to metal to learn caustic solution; Be applied on the common metal, the steps include: to provide resin host and a kind of nco value the curing agent 15 or more of a kind of amine purity more than 99%, then let this resin host and this curing agent; Get into mixing in the high pressure-temperature airless sprayer with 1: 1 ratio, and spray on this metallic surface with the temperature of 65 degree-75 degree Celsius and the pressure of 2000-3000psi.
According to method of the present invention; Resin host is mixed with curing agent to spray on metallic surface and is formed a rigidity polyureas protective layer and this rigidity polyureas protective layer formed above 3 hours; Need on this rigidity polyureas protective layer, to spray priming paint earlier, continue spraying again and form this rigidity polyureas protective layer.
According to method of the present invention, this resin host is mixed with this curing agent and is sprayed after forming a rigidity polyureas protective layer on this metallic surface, coats an edge sealing adhesive in the composition surface of this rigidity polyureas protective layer and this metal again.
After adopting method of the present invention to carry out preservative treatment; Can be on metallic surface form one have rerum natura such as high adhesion force rigidity polyureas protective layer; This protective layer has the remarkable characteristics such as rerum natura of environmental protection coating material of the 3-5 quick curing of second, hydro-insensitive, 100% solid content; And rigidity polyureas protective layer is attached to can reach the rerum natura that the above adhesive force of 105kgf/cm and anti-cathodic disbonding did not have excellences such as peeling off in 28 days on this metal; Thereby can protect this metal to avoid the erosion of chemical attack and electrochemical corrosion, prolong the service life of metal, and have advantages such as construction is simple and easy, the duration is short.
Description of drawings
Fig. 1 is high pressure-temperature airless sprayer spraying sketch map of the present invention.
Fig. 2 is the metal structure profile after the present invention spraying
The specific embodiment
Relevant detailed content of the present invention and technical descriptioon combine accompanying drawing to be described further with embodiment at present, but will be appreciated that, this embodiment is merely the preferable usefulness that illustrates, and should not be interpreted as the restriction of the present invention's enforcement.
As shown in Figure 1, the present invention learns caustic solution for a kind of electrochemically resistant that is applied to metal, is applied on the metal 10, and its step comprises:
Step (1). A is provided agent: the resin host 20 of an amine purity more than 99%;
Step (2). B is provided agent: the curing agent 30 of a nco value more than 15;
Step (3). let this resin host 20 and this curing agent 30, get in the high pressure-temperature airless sprayer 40 with 1: 1 ratio and mix, and spray on the surface of this metal 10 with the temperature of 65 degree-75 degree Celsius and the pressure of 2000-3000psi.
Wherein step (1) is not distinguished with step (2) orderly, and it mainly is to prepare as the resin host 20 of A agent and the curing agent 30 of B agent.Step (3) gets into as the resin host 20 of A agent and the curing agent 30 of B agent for letting that this high pressure-temperature airless sprayer 40 is interior to be mixed and control temperature and pressure; And these high pressure-temperature airless sprayer 40 control temperature and pressure are the common technological means of convention; Do not add explanation at this; The A agent with promptly can slowly solidify after the B agent mixes, and the surface that before solidifying, utilizes this high pressure-temperature airless sprayer 40 to be sprayed into this metal 10 produces a rigidity polyureas protective layer 50, and is as shown in Figure 2.
If mixing with this curing agent 30, this resin host 20 sprays on the surface of this metal 10 formation one rigidity polyureas protective layer 50 and 50 formation of this rigidity polyureas protective layer again above 3 hours; Need on this rigidity polyureas protective layer 50, to spray earlier priming paint (figure does not show); Continue spraying again and form this rigidity polyureas protective layer 50, do not reach code requirement with the adhesive force of this rigidity polyureas protective layer 50 of avoiding the different time spraying.And this resin host 20 is mixed with this curing agent 30 and is sprayed after forming a rigidity polyureas protective layer 50 on the surface of this metal 10; Can coat an edge sealing adhesive (figure does not show) again in this rigidity polyureas protective layer 50 and the composition surface of this metal 10; To increase sealing, in case air or aqueous vapor are infiltrated the composition surface of this rigidity polyureas protective layer 50 and this metal 10.
According to method of the present invention; Preferred forms of the present invention is to select the resin host 20 of amine purity more than 99% for use; And the nco value of selecting curing agent 30 for use is 17.3; And control ejection temperature is that 70 degree Celsius, ejection pressure are 2500psi, and this rigidity polyureas protective layer 50 that it produced in view of the above can reach 115kgf/cm2 in the adhesive force of this metal 10.
As stated; The present invention can form the rigidity polyureas protective layer 50 of a tool high adhesion force on the surface of this metal 10; This rigidity polyureas protective layer 50 is a rigidity polyureas protective layer, and it has quick curing, hydro-insensitive, 100% solid content environmental protection coating material, remarkable characteristics such as rerum natura, and experiment is learnt that this rigidity polyureas protective layer 50 is attached to and can be reached the rerum natura that the above adhesive force of 105kgf/cm and anti-cathodic disbonding did not have excellences such as peeling off in 28 days on this metal 10; Thereby can protect this metal 10 to avoid the erosion of chemical attack and electrochemical corrosion; Prolong the service life of metal 10, and have advantages such as construction is simple and easy, the duration is short, can satisfy the demand in the use.
Those of ordinary skill in the art will be appreciated that the foregoing description is merely preferred embodiment of the present invention, is not to be used for limiting the scope that the present invention implements.All equalizations of doing according to claim of the present invention change and modify, and all will drop in the scope of claims of the present invention.
Claims (6)
1. an electrochemically resistant that is applied to metal is learned caustic solution, is applied on the metal, and its step comprises:
(1). A is provided agent: the resin host of an amine purity more than 99%;
(2). B is provided agent: the curing agent of a nco value more than 15;
(3). let this resin host and this curing agent, get in the high pressure-temperature airless sprayer with 1: 1 ratio and mix, and spray on this metallic surface with the temperature of 65 degree-75 degree Celsius and the pressure of 2000-3000psi.
2. learn caustic solution like the described a kind of electrochemically resistant that is applied to metal of claim one, wherein the ejection temperature of this high pressure-temperature airless sprayer is 70 degree Celsius.
3. learn caustic solution like the described a kind of electrochemically resistant that is applied to metal of claim one, wherein the ejection pressure of this high pressure-temperature airless sprayer is 2500psi.
4. learn caustic solution like the described a kind of electrochemically resistant that is applied to metal of claim one, wherein the nco value of curing agent is 17.3.
5. learn caustic solution like the described a kind of electrochemically resistant that is applied to metal of claim one; Wherein this resin host is mixed with this curing agent to spray on this metallic surface and is formed a rigidity polyureas protective layer and this rigidity polyureas protective layer formed above 3 hours; Need on this rigidity polyureas protective layer, to spray priming paint earlier, continue spraying again and form this rigidity polyureas protective layer.
6. learn caustic solution like the described a kind of electrochemically resistant that is applied to metal of claim one; Wherein mix with this curing agent and spray after forming a rigidity polyureas protective layer on this metallic surface, coat an edge sealing adhesive in the composition surface of this rigidity polyureas protective layer and this metal again in this resin host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110054081.XA CN102649114B (en) | 2011-02-23 | 2011-02-23 | Electrochemical corrosion resistance method for metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110054081.XA CN102649114B (en) | 2011-02-23 | 2011-02-23 | Electrochemical corrosion resistance method for metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102649114A true CN102649114A (en) | 2012-08-29 |
| CN102649114B CN102649114B (en) | 2014-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110054081.XA Expired - Fee Related CN102649114B (en) | 2011-02-23 | 2011-02-23 | Electrochemical corrosion resistance method for metal |
Country Status (1)
| Country | Link |
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| CN (1) | CN102649114B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060046068A1 (en) * | 2004-09-02 | 2006-03-02 | Barancyk Steven V | Multi-component coatings that include polyurea coating layers |
| CN101818019A (en) * | 2009-02-26 | 2010-09-01 | 北京东方雨虹防水技术股份有限公司 | Spray polyurea high-performance waterproof paint and preparation method thereof |
-
2011
- 2011-02-23 CN CN201110054081.XA patent/CN102649114B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060046068A1 (en) * | 2004-09-02 | 2006-03-02 | Barancyk Steven V | Multi-component coatings that include polyurea coating layers |
| CN101818019A (en) * | 2009-02-26 | 2010-09-01 | 北京东方雨虹防水技术股份有限公司 | Spray polyurea high-performance waterproof paint and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| HUNTSMAN: "产品说明书", 《HUNTSMAN》 * |
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| CN102649114B (en) | 2014-03-12 |
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