CN102649114B - Electrochemical corrosion resistance method for metal - Google Patents
Electrochemical corrosion resistance method for metal Download PDFInfo
- Publication number
- CN102649114B CN102649114B CN201110054081.XA CN201110054081A CN102649114B CN 102649114 B CN102649114 B CN 102649114B CN 201110054081 A CN201110054081 A CN 201110054081A CN 102649114 B CN102649114 B CN 102649114B
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- metal
- protective layer
- rigidity
- temperature
- polyureas protective
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- 239000002184 metal Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title abstract description 15
- 238000006056 electrooxidation reaction Methods 0.000 title abstract description 8
- 239000011241 protective layer Substances 0.000 claims abstract description 38
- 229920002396 Polyurea Polymers 0.000 claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 34
- 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 17
- 239000003518 caustics Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 239000003973 paint Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 230000037452 priming Effects 0.000 claims description 4
- 239000012945 sealing adhesive Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 11
- 230000007797 corrosion Effects 0.000 abstract description 10
- 230000000704 physical effect Effects 0.000 abstract description 7
- 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
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 24
- 238000000576 coating method Methods 0.000 description 24
- 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
- 230000008569 process Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 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
- 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
- 238000010586 diagram 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
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect 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
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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 is mixed by a high-pressure high-temperature airless sprayer in a ratio of 1: 1 at a temperature of 65-75 ℃ and 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 method that electrochemically resistant that is applied to metal is learned corrosion.
background of invention and prior art
Metal erosion is mainly divided into two kinds of chemical attack and electrochemical corrosion, and 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 industrial important issue.
The method that is most commonly used at present prevent metal erosion for forming a rigidity polyureas protective layer on metallic surface; by this rigidity polyureas protective layer, in metallic surface, form fine and close isolation layer; the element that corrosion process capable of blocking is required; as water, oxygen and extraneous stray electrical current etc., and then reach the object that 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 B agent, and A agent and B agent are inputted the interior muzzle of a high pressure-temperature airless sprayer simultaneously and mixed and be sprayed into this metallic surface again, and snap cure forms this rigidity polyureas protective layer.
Industrial conventional resin has epoxy, PU (polyurethane), presses and make every effort to overcome (acrylic acid) etc. at present, and curing agent from TDI the earliest, develop into MDI to up-to-date HDI etc., different resin materials mixes different curing agents and has different physical property, if with PU, it has the problems such as hydrolysising aging, heat ageing, UV be aging, and the above-mentioned resin material of commonly using is all elastomer formula, its poor adhesive force, water permeability are large, so in engineering, need high thickness could meet the demand that electrochemically resistant is learned corrosion.
According to standard, coating must reach following detection standard could meet the demand that electrochemically resistant is learned corrosion.
The first is
adhesive force (Adhesion)，SGS testing agency is more than 105kgf/cm2 according to ASTM D4541 standard criterion detected value.The adhesive force of coating has been considered to a coating good index in service life, to reach pre-etch-proof adhesive force, and It is generally accepted must be at 1000psi (70kgf/cm2), and the adhesive force of coating is also longer larger its service life.Coating has the ability of opposing electrochemical corrosion and the effect that splendid resistance to the moon is peeled off if any the above adhesive force of 1500psi (105kgf/cm2) for metallic surface.
Second
for 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 measurement pattern of liner under cutting, and in engineering, experience shows, the resistance to cathodic disbonding of application and liner is higher, and the corrosion-resistant stronger service life of coating is also longer.
The 3rd is
dielectric strength (Dielectric strength), ASTM D149 standard criterion detected value is: run through intensity 20.79kv/mm. disintegration voltage 40.33kv.In application application, cathodic protection must will have good dielectric strength, and cathodic protection potential and electric current are by the ability not affecting as corrosion protection barrier like this.The coating of cathodic protection has good insulating properties can allow electric current, voltage can not affect coating, just can reach corrosion-resisting function.If the coating of low insulation because of insulating properties not high, electric current by time can be below coating or surface produce cathodic deposition coating lost efficacy, coating surface can produce metal dust.
The 4th is
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, volume resistance value is 1.342 * 1018/ohm.cm.Coating needs ability cathodic disbonding; cathodic protection is focused on especially coating and is wanted to bear stronger electric shock at metal base junction (welding bead); although the effect of cathodic disbonding; do not have coating can continue to accept electric shock always and do not produce and peel off; but experience shows; the better impedance strength of resistance to cathodic disbonding of application and liner is higher, and the corrosion resistance of coating is better, and service life is also longer.Volume impedance and surface impedance are that to detect that coating coating impedance strength more shows be that coating insulation degree is higher.
The 5th is
water absorptivity (Water absorption), vapor permeability (Water vapor rmeability)，SGS testing agency is according to ASTM D570 standard criterion detected value, and water absorptivity is 0.96%; According to ASTM D1653 standard criterion detected value vapor permeability, be 0.196g/hm2.Due to the field of application application, application coating is also very important for moisture-resistant impervious, because moisture increase can make that base material application is inner to produce loss of adhesion or reduce dielectric strength, and affects coating service life.
The 6th is
salt spray test (Salt spray)sGS testing agency 3000 hours is without foaming salt spray test, to be also the measurement pattern of a kind of testing coating tolerance under cutting 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; current rigidity polyureas protective layer; generally all there is priming paint, the structure such as paint, three layers of finish paints midway; the material of its use is different; and once the thickness of spraying is restricted; thereby operational procedure complicated and need repeatedly spray and the engineering time long, difficult quality meets the demand in 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 deficiencies in the prior art; Adopt the method to simplify working process; reduction of erection time; after the method is processed, can produce in metal surface the rigidity polyureas protective layer of a tool high adhesion force, resistance to cathodic disbonding, resistance to dielectric and volume impedance etc., to protect the generation of metal and antagonism electrochemical corrosion.
For achieving the above object, the invention provides a kind of electrochemically resistant that is applied to metal and learn caustic solution, be applied on common metal, the steps include: to provide more than 99% resin host and more than 15 curing agent of a kind of nco value of a kind of amine purity, then allow this resin host and this curing agent, with the ratio of 1: 1, enter in a high pressure-temperature airless sprayer and mix, 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 and on metallic surface, is formed a rigidity polyureas protective layer and this rigidity polyureas protective layer and form over 3 hours; need on this rigidity polyureas protective layer, first spray priming paint, then continue this rigidity polyureas protective layer of spraying formation.
According to method of the present invention, this resin host is mixed with this curing agent to spray and on this metallic surface, is formed after a rigidity polyureas protective layer, then coats an edge sealing adhesive in the composition surface of this rigidity polyureas protective layer and this metal.
Adopt method of the present invention to carry out after preservative treatment, can on metallic surface, form a rigidity polyureas protective layer with physical property such as high adhesion forces, this protective layer has the 3-5 rapid curing of second, hydro-insensitive, the features such as physical property of the environmental protection coating material brilliance of 100% solid content, and rigidity polyureas protective layer is attached on this metal can reach adhesive force and 28 days physical property without excellences such as peeling off of resistance to cathodic disbonding more than 105kgf/cm, thereby can protect this metal to avoid the erosion of chemical attack and electrochemical corrosion, extend the service life of metal, and it is simple and easy to have construction, the advantages such as the duration is short.
Accompanying drawing explanation
Fig. 1 is high pressure-temperature airless sprayer spraying schematic diagram of the present invention.
Fig. 2 is the metal structure profile after the present invention sprays
The specific embodiment
Relevant detailed content of the present invention and technical descriptioon, be now described further with embodiment by reference to the accompanying drawings, but will be appreciated that, this embodiment is the use for preferably illustrating only, and should not be interpreted as the restriction of the invention process.
As shown in Figure 1, the present invention is that a kind of electrochemically resistant that is applied to metal is learned caustic solution, is applied on a metal 10, and its step comprises:
Step (1). provide A agent: the more than 99% resin host 20 of an amine purity;
Step (2). provide B agent: more than 15 curing agent 30 of a nco value;
Step (3). allow this resin host 20 and this curing agent 30, with the ratio of 1: 1, enter the interior mixing of a high pressure-temperature airless sprayer 40, 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 orderly with step (2), and it is mainly to prepare as the resin host 20 of A agent and the curing agent 30 of B agent.Step (3) enters as the resin host 20 of A agent and the curing agent 30 of B agent for allowing that this high pressure-temperature airless sprayer 40 is interior to be mixed and control temperature and pressure; and this high pressure-temperature airless sprayer 40 controls temperature and pressure is known common technological means; at this, do not add explanation; A agent can slowly solidify after mixing with B agent; and the surface that utilized this high pressure-temperature airless sprayer 40 to be sprayed into this metal 10 before solidifying produces a rigidity polyureas protective layer 50, as shown in Figure 2.
If this resin host 20 is mixed with this curing agent 30 to spray and is formed a rigidity polyureas protective layer 50 and this rigidity polyureas protective layer 50 form over 3 hours on the surface of this metal 10 again; need on this rigidity polyureas protective layer 50, first spray priming paint (not shown); continue again spraying and form this rigidity polyureas protective layer 50, to avoid the adhesive force of this rigidity polyureas protective layer 50 of different time spraying not reach code requirement.And this resin host 20 is mixed with this curing agent 30 to spray and on the surface of this metal 10, is formed after a rigidity polyureas protective layer 50; can in this rigidity polyureas protective layer 50 and the composition surface of this metal 10, coat an edge sealing adhesive (not shown) again; to increase sealing, with air-prevention or aqueous vapor, infiltrate 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 more than 99% resin host 20 of amine purity; and the nco value of selecting curing agent 30 is 17.3; and control ejection temperature is that 70 degree Celsius, ejection pressure are 2500psi; its this rigidity polyureas protective layer 50 producing, in the adhesive force of this metal 10, can reach 115kgf/cm2 accordingly.
As mentioned above, 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 rigidity polyureas protective layer, it has rapid curing, hydro-insensitive, 100% solid content environmental protection coating material, the remarkable features such as physical property, and experiment learns that this rigidity polyureas protective layer 50 is attached to adhesive force and 28 days physical property without excellences such as peeling off of resistance to cathodic disbonding that can reach on this metal 10 more than 105kgf/cm, thereby can protect this metal 10 to avoid the erosion of chemical attack and electrochemical corrosion, extend the service life of metal 10, and it is simple and easy to have construction, the advantages such as the duration is short, can meet the demand in use.
Those of ordinary skill in the art will be appreciated that, above-described embodiment is only preferred embodiment of the present invention, is not used for limiting scope of the invention process.All equalizations of doing according to the present patent application the scope of the claims change and modify, and all will drop in the scope of the claims in the present invention book.
Claims (5)
1. the electrochemically resistant that is applied to metal is learned a caustic solution, is applied on a metal, and its step comprises:
(1). provide A agent: the more than 99% resin host of an amine purity;
(2). provide B agent: the curing agent that a nco value is 17.3;
(3). allow this resin host and this curing agent, with the ratio of 1:1, enter in a high pressure-temperature airless sprayer and mix, and spray on this metallic surface with the temperature of 65 degree-75 degree Celsius and the pressure of 2000-3000psi.
2. a kind of electrochemically resistant that is applied to metal as claimed in claim 1 is learned caustic solution, and wherein the ejection temperature of this high pressure-temperature airless sprayer is 70 degree Celsius.
3. a kind of electrochemically resistant that is applied to metal as claimed in claim 1 is learned caustic solution, and wherein the ejection pressure of this high pressure-temperature airless sprayer is 2500psi.
4. a kind of electrochemically resistant that is applied to metal as claimed in claim 1 is learned caustic solution; wherein this resin host is mixed with this curing agent to spray and on this metallic surface, is formed a rigidity polyureas protective layer and this rigidity polyureas protective layer and form over 3 hours; need on this rigidity polyureas protective layer, first spray priming paint, then continue this rigidity polyureas protective layer of spraying formation.
5. a kind of electrochemically resistant that is applied to metal as claimed in claim 1 is learned caustic solution; wherein in this resin host, mix to spray on this metallic surface, forming after a rigidity polyureas protective layer with this curing agent, then coat an edge sealing adhesive in the composition surface of this rigidity polyureas protective layer and this metal.
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 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110054081.XA CN102649114B (en) | 2011-02-23 | 2011-02-23 | Electrochemical corrosion resistance method for metal |
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| Publication Number | Publication Date |
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| CN102649114A CN102649114A (en) | 2012-08-29 |
| CN102649114B true CN102649114B (en) | 2014-03-12 |
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| CN201110054081.XA Expired - Fee Related CN102649114B (en) | 2011-02-23 | 2011-02-23 | Electrochemical corrosion resistance method for metal |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0515236A (en) * | 2004-09-02 | 2008-07-15 | Ppg Ind Ohio Inc | polyurea coating composition, multi-component composite coating, coated article, method for forming a polyurea coating on a substrate and method for forming a coated article |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 (2)
| Title |
|---|
| Huntsman.产品说明书.《Huntsman》.2007,第1-6页. |
| 产品说明书;Huntsman;《Huntsman》;20071231;第1-6页 * |
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| CN102649114A (en) | 2012-08-29 |
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