CN101717942A - Metal surface anti-corrosion layer structure and coating method thereof - Google Patents
Metal surface anti-corrosion layer structure and coating method thereof Download PDFInfo
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Abstract
The invention provides a metal surface anti-corrosion layer structure and a coating method thereof. The anti-corrosion layer structure comprises a priming paint layer of 40-80 mu m, an intermediate paint layer of 50-100 mu m and a surface paint layer of 40-80 mu m, wherein, the priming paint layer is formed by coating object system paint on epoxy-polyamide, the intermediate paint layer is formed by coating object system paint on heavy-sizing epoxy-polyamide, and the surface paint layer formed by coating acrylic acid polyurethane system paint. The coating method comprises coating the priming paint layer on the metal surface; coating the intermediate paint layer on the priming paint layer; and coating the surface paint layer on the intermediate paint layer. The metal surface anti-corrosion layer structure in the embodiment of the invention has good anti-corrosion performance, ageing resistance and mechanical performance, simple technique, low cost which is lower than that of commonly used powdery paints at present, and no heavy metals, which is environment-friendly.
Description
Technical field
The present invention relates to a kind of metal surface anti-corrosion layer structure and coating method thereof, especially relate to a kind of marine aluminium alloy base material electric installation surface anticorrosion layer structure and coating method thereof.
Background technology
Ocean exploitation in recent years is subjected to generally paying attention to, various sea transport instruments, and all kinds of boats and ships and offshore production facility miscellaneous all are with metal.These are costly, the considerable metal structures of consumption have is in all the year round that wind, mist are overflow, drenched with rain, the marine atmosphere zone of Exposure to Sunlight, what have is in the morning and evening tides that haunts repeatedly, the splash zone of wave all the year round, and the flowing seawater that is subjected to all the year round that has soaks brush, is in the submerged zone that contains the bacterium ooze.In abominable like this ocean environment, the corrosion of metal velocity ratio is much bigger on land.Simultaneously, development along with modern times illumination industry, industrial environment is more and more higher to the stability and the reliability requirement of electric installation and attached member thereof, wherein, one of problem demanding prompt solution is exactly the protection against corrosion problem of electric installation material, especially under bad working environments, in the middle of environment such as ocean platform, naval base and petrochemical industry, want to improve electric product work-ing life, Corrosion Protection almost becomes the most key index of weighing the electric installation quality.
After being in electric installation in the ocean environment and being corroded, in case electric installation lost efficacy because of corrosion, will cause the loss on oceanographic engineering and the offshore production business economic, even can constitute a serious threat industrial production safety.Wherein, especially some local corrosions as the pitting and the stress corrosion cracking of electric installation shell, usually are to take place suddenly, may cause the sparking blast, also can cause environmental pollution even unexpected fatal accident.
At present; the surfacecti proteon treatment process of explosion-proof high-risk environment electric installation mainly contains two kinds: a kind of is to adopt static spray epoxy polyester molding powder coating processes to apply on the surface of electric installation; then electric installation integral body is placed on heating room internal heating; this kind processing method is difficult to resist marine atmosphere district salinity; especially pitting corrosion and spot corrosion, the penetrating power extreme difference of resisting chloride ion penetration, and coat-thickness is not enough; weather-proof UV resistant validity period is short, and the UV resistant performance is also very poor.Another kind is to have under the situation of large-scale electrolytic plating pool, in batches whole lamp is carried out the electronickelling Chrome metal powder, and at the heavy protective coating of surface-coated zinc-base, this method can effectively be resisted general maritime environment atmosphere and corrode, but input cost is very high, complex procedures production efficiency is lower, and causes serious environmental to pollute when electroplating.
Summary of the invention
The purpose of the embodiment of the invention is, a kind of metal surface anti-corrosion layer structure is provided, and is intended to solve coating poor corrosion resistance, thickness low LCL, the short problem of weather-proof UV resistant validity period of existing metallic surface.
Another purpose of the embodiment of the invention is, provides a kind of metallic surface anticorrosion coating method.
The metal surface anti-corrosion layer structure of the embodiment of the invention, comprise the prime coat that from inside to outside is coated on the metallic surface, middle enamelled coating and top coat layer three coatings, prime coat thickness is 40～80 μ m, the intermediate coat layer thickness is 50～100 μ m, top coat layer thickness is 40～80 μ m, and wherein, prime coat is applied by epoxy-polymeric amide affixture system coating and forms, middle enamelled coating is applied by thick paste type epoxy-polymeric amide affixture system coating and forms, and top coat layer is applied by acroleic acid polyurethane system coating and forms.
The anticorrosion coating method in the metallic surface of the embodiment of the invention comprises the steps:
Epoxy-polymeric amide affixture system coating is applied in the metallic surface, form the prime coat that a layer thickness is 40～80 μ m;
Thick paste type epoxy-polymeric amide affixture system coating is applied above prime coat, and forming a layer thickness is the middle enamelled coating of 50～100 μ m;
Acroleic acid polyurethane system coating is applied above middle enamelled coating, form the top coat layer that a layer thickness is 40～80 μ m.
Technique scheme, because it adopts epoxy-polymeric amide affixture system as the prime coat raw material, and the polyamines that has reactive behavior in the polymeric amide, especially have and adhere to active group more by force, can drive all gases and moisture in the non-ferrous metal micropore, and occupy these micropores, by Van der Waals force and surface adsorption effect, with the ground mortise, overcome the shortcoming of existing application system priming paint and non-ferrous metal substrate adhesion difference.
Since adopt thick paste type epoxy-polymeric amide affixture system as in the doped envelope raw material, make protective film become the coating that hardness, snappiness have both, existing certain toughness is easy to polishing again.
Owing to adopt the acroleic acid polyurethane system as the top coat layer raw material, and alcohol and carboxylic acid in the urethane resin, make the main chain of urethane resin in the finish paint component become the hard segment of lengthening, has fine and close reticulated structure, thereby form the paint film tough and tensile, that barrier propterty is good, improved the intrusion of ocean environment weathering resistance and chlorion greatly metallic matrix.
Like this, the metal surface anti-corrosion layer structure of the embodiment of the invention, its antiseptic property, ageing resistance, satisfactory mechanical property are referring to the embodiment list data.
In addition, metal surface anti-corrosion layer structure of the present invention, adopt the method that directly applies to form, and do not use poisonous elements such as heavy metal and sulphur phosphorus, have now at metallic surface electronickelling Chrome metal powder relatively and apply the method for the heavy protective coating of zinc-base, not only technology is simple, and cost is lower than the powder coating that generally adopts at present, and environmental protection.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention provides a kind of antiseptic property, ageing resistance, mechanical property all can meet the metal surface anti-corrosion layer structure that the protecting metallic surface of marine severe environment requires, particularly, this metal surface anti-corrosion layer structure, comprise the prime coat that from inside to outside is coated on the metallic surface, middle enamelled coating and top coat layer three coatings, prime coat thickness is 40～80 μ m, the intermediate coat layer thickness is 50～100 μ m, top coat layer thickness is 40～80 μ m, wherein, prime coat is applied by epoxy-polymeric amide affixture system coating and forms, middle enamelled coating is applied by thick paste type epoxy-polymeric amide affixture system coating and forms, and top coat layer is applied by acroleic acid polyurethane system coating and forms.Because it adopts epoxy-polymeric amide affixture system as the prime coat raw material, and the polyamines that has reactive behavior in the polymeric amide, especially have and adhere to active group more by force, can drive all gases and moisture in the non-ferrous metal micropore, and occupy these micropores, by Van der Waals force and surface adsorption effect,, overcome the shortcoming of various non-ferrous metal substrate adhesion differences such as existing application system priming paint and aluminium alloy, zinc with the ground mortise.
Since adopt thick paste type epoxy-polymeric amide affixture system as in the doped envelope raw material, make protective film become the coating that hardness, snappiness have both, existing certain toughness is easy to polishing again.
Owing to adopt the acroleic acid polyurethane system as the top coat layer raw material, and alcohol and carboxylic acid in the urethane resin, make the main chain of urethane resin in the finish paint component become the hard segment of lengthening, has fine and close reticulated structure, thereby form the paint film tough and tensile, that barrier propterty is good, improved the intrusion of the weathering resistance of metal pair ocean environment and chlorion greatly metallic matrix.
Like this, metal surface anti-corrosion layer structure of the present invention, its antiseptic property, ageing resistance and satisfactory mechanical property are referring to the embodiment list data.
More specifically, above-mentioned prime coat thickness is 60～70 μ m, and the intermediate coat layer thickness is 70～80 μ m, and top coat layer thickness is 70～80 μ m.
The embodiment of the invention also provides a kind of metallic surface anticorrosion coating method, comprises the steps:
Epoxy-polymeric amide affixture system coating is applied in the metallic surface, form the prime coat that a layer thickness is 40～80 μ m;
Thick paste type epoxy-polymeric amide affixture system coating is applied above prime coat, and forming a layer thickness is the middle enamelled coating of 50～100 μ m;
Acroleic acid polyurethane system coating is applied above middle enamelled coating, form the top coat layer that a layer thickness is 40～80 μ m.
Wherein, in above-mentioned each coating, can also add the thinner that is no more than this coating gross weight 20% as required.
There is no particular restriction for above-mentioned thinner, be this area thinner commonly used, for example can select one or more the combination among dimethylbenzene, toluene, butanols, ethanol, propyl alcohol, Virahol, N-BUTYL ACETATE, vinyl acetic monomer, pimelinketone, butanone, acetone, ethylene glycol monomethyl ether, ethylene glycol ethyl ether, butyl glycol ether and the DBE (dibasic esters, dibasic ester).
The anticorrosion coating method in above-mentioned metallic surface is suitable for various non-ferrous metals, for example, applies in aluminium alloy, copper, zinc-base surface, and being particularly suitable for the aluminium alloy is the anticorrosion coating of marine engineering of ground.
The anticorrosion coating method in above-mentioned metallic surface can adopt this area coating method commonly used to apply, and for example, can adopt spraying, brushing and roll coating model to apply.
Further, the anticorrosion coating method in above-mentioned metallic surface, wherein, epoxy-polymeric amide affixture system coating is by forming than the Resins, epoxy and the polymeric amide preparation that are 2: 1～4: 1; Described thick paste type epoxy-polymeric amide affixture system coating is that 2: 1～4: 1 thick paste type epoxy resin and polymeric amide preparation form by weight ratio; Described acroleic acid polyurethane system coating is that 5: 1～7: 1 vinylformic acid and urethane are formulated by weight ratio.Further preferred scheme is, epoxy-polymeric amide affixture system coating is that 3: 1 Resins, epoxy is prepared with polymeric amide and formed by weight ratio; Thick paste type epoxy-polymeric amide affixture system coating is that 3: 1 thick paste type epoxy resin and polymeric amide preparation form by weight ratio; Acroleic acid polyurethane system coating is that 7: 1 vinylformic acid and urethane is formulated by weight ratio.
Further, the anticorrosion coating method in above-mentioned metallic surface also comprises the preceding pre-treatment step to metal base surface of primer coating, promptly remove substrate surface grease and impurity, the removing way is this area way commonly used, for example, can remove by pickling, clear water, deionized water successively; At the metal base surface sanding, derusting grade is to Sa 2.5～3.0 then.
Further, above-mentioned middle enamelled coating applies after the prime coat drying; Described top coat layer applies after middle enamelled coating drying.
Embodiment 1
Select for use a kind of offshore used for oil platform explosion-proof lamp (lamp outer casing is an aluminium alloy) that its outside surface is applied, processing step is:
1, preparation primer base: priming paint is that the solidifying agent that 3: 1 Resins, epoxy and polymeric amide preparation forms is formed by weight ratio, pours in the watering can, in use constantly stirring.
2, successively by acid, clear water, washed with de-ionized water step, thoroughly remove substrate surface grease and other impurity; Then, at the metal base surface sanding, derusting grade is to Sa 2.5～3.0.At least reach Sa2.5 after the sandblast, be sharp uneven surface.
3, to the priming paint spraying of entire structure or component, all dead angles of whole simultaneously modulated structure or its component all should the emphasis spraying.Injection diameter requirement 0.5mm when spraying paint by hand, the fan angle is 40 degree.Sprayed surface requires: paint spray nozzle adopts injection diameter 0.48～0.53mm, and the fan angle requires sprayed surface.The parts of hanging are the spray top earlier, sprays its both sides then, at last the spray bottom.Recoat 4 hours at interval, priming paint reach to refer to touch and spray intermediate coat again after doing.
Priming paint thickness reaches 80 μ m (priming paint total thickness).
4, the construction of intermediate layer paint: intermediate layer paint coating is that 3: 1 the thick paste type epoxy resin and the solidifying agent of polymeric amide preparation are formed by weight ratio, pours in the watering can, constantly stirs in use.Injection diameter 0.5mm, the fan angle is 60 degree.Wherein have a strong impact on the zone of visual appearance, need to wipe off with the atom ash.Recoat 3 hours at interval.
The paint film of intermediate layer paint (dry film) thickness reaches 100 μ m.
5, the construction of finish paint: finish paint coating is that the solidifying agent that 7: 1 vinylformic acid and urethane are made into is formed by weight ratio.Injection diameter requirement 0.48mm when spraying paint by hand, pressure is 150bar.Requiring intermediate layer paint to reach finger before the construction touches dried.
The paint film of finish paint (dry film) thickness requirement reaches 80 μ m.
6, put into the determined location cleaning chamber after having sprayed and dry, paint film (dry film) total thickness of doing back application system reaches 260 μ m with the measurement of dry film detector.
Certainly, when above-mentioned prime coat coating, intermediate coat coating and finish paint coating are prepared, wherein can also add thinner, thinner is this area thinner commonly used, for example can select one or more the combination among dimethylbenzene, toluene, butanols, ethanol, propyl alcohol, Virahol, N-BUTYL ACETATE, vinyl acetic monomer, pimelinketone, butanone, acetone, ethylene glycol monomethyl ether, ethylene glycol ethyl ether, butyl glycol ether and the DBE (dibasic esters, dibasic ester).In the coating gross weight, amount of diluent is not more than 20%.
Embodiment 2
Substantially the same manner as Example 1, difference is: be used for zinc die casting alloys base material electrical connector surface, prime coat coating, intermediate coat coating and finish paint coating are formed by solidifying agent and thinner, wherein, to adopt weight ratio be that 3: 1 Resins, epoxy is prepared with polymeric amide and formed to solidifying agent in the prime coat coating, solidifying agent is that 3: 1 thick paste type epoxy resin and polymeric amide preparation form by weight ratio in the intermediate coat coating, solidifying agent is that 7: 1 vinylformic acid and urethane are formulated by weight ratio in the finish paint coating, thinner all adopts butanols, amount of diluent is 5% weight in each layer coatings formulated, prime coat thickness is 50 μ m, the intermediate coat layer thickness is 50 μ m, and top coat layer thickness is 50 μ m.Certainly, thinner also can adopt other thinner commonly used of this area, and diluent ratio is not more than each layer coatings formulated gross weight 20% and all can realizes.
Embodiment 3
Substantially the same manner as Example 2, difference is: be used for admiraltymetal base material stuffing box peculiar to vessel surface, to adopt weight ratio be that 3: 1 Resins, epoxy is prepared with polymeric amide and formed to solidifying agent in the prime coat coating, to adopt weight ratio be that 3: 1 thick paste type epoxy resin is prepared with polymeric amide and formed to solidifying agent in the intermediate coat coating, solidifying agent is that 6: 1 vinylformic acid and urethane are formulated by weight ratio in the finish paint coating, thinner all adopts the mixture of propyl alcohol and toluene, amount of diluent is 8% weight in each layer coatings formulated, prime coat thickness is 40 μ m, the intermediate coat layer thickness is 50 μ m, and top coat layer thickness is 40 μ m.Certainly, thinner also can adopt other thinner commonly used of this area, and diluent ratio is not more than each layer coatings formulated gross weight 20% and all can realizes.
Embodiment 4
Substantially the same manner as Example 2, difference is: be used for boats and ships 6061 punching press aluminium sheet switch box surfaces, to adopt weight ratio be that 2: 1 Resins, epoxy is prepared with polymeric amide and formed to solidifying agent in the prime coat coating, solidifying agent is that 2: 1 thick paste type epoxy resin and polymeric amide preparation form by weight ratio in the intermediate coat coating, solidifying agent is that 5: 1 vinylformic acid and urethane are formulated by weight ratio in the finish paint coating, thinner all adopts dimethylbenzene, amount of diluent is 10% weight in each layer coatings formulated, prime coat thickness is 70 μ m, the intermediate coat layer thickness is 80 μ m, and top coat layer thickness is 80 μ m.Certainly, thinner also can adopt other thinner commonly used of this area, and diluent ratio is not more than each layer coatings formulated gross weight 20% and all can realizes.
Embodiment 5
Substantially the same manner as Example 2, difference is: be used for boats and ships galvanizing electrical equipment pipeline surface, to adopt weight ratio be that 4: 1 Resins, epoxy is prepared with polymeric amide and formed to solidifying agent in the prime coat coating, to adopt weight ratio be that 4: 1 thick paste type epoxy resin is prepared with polymeric amide and formed to solidifying agent in the intermediate coat coating, solidifying agent is that 7: 1 vinylformic acid and urethane are formulated by weight ratio in the finish paint coating, thinner all adopts pimelinketone, the mixture of butanone and acetone, amount of diluent is 15% weight in each layer coatings formulated, prime coat thickness is 50 μ m, the intermediate coat layer thickness is 50 μ m, and top coat layer thickness is 70 μ m.Certainly, thinner also can adopt other thinner commonly used of this area, and diluent ratio is not more than each layer coatings formulated gross weight 20% and all can realizes.
Comparative Examples 1
Adopt existing plastic-blasting powder coating processes that offshore used for oil platform explosion-proof lamp among the embodiment 1 is applied.
The various embodiments described above and Comparative Examples are tested, and test result sees Table 1.
The appearance of film survey requirement is complete for filming, smooth smooth and gloss is even in the table 1;
The wear resistance survey requirement is a 750g/500r weightlessness; Thickness requires 80～100 μ m;
It is 1 grade that the sticking power class inspection requires;
The pencil hardness class inspection requires to be H;
To be that 50Kgcm is positive and negative pass through the shock strength survey requirement;
Acid resistance detects and adopts 5%H
2SO
4Carry out under 5 ± 1 ℃ of conditions, survey requirement is the 6h no change;
Alkali resistance detects and adopts 5%NaOH to carry out under 25 ± 1 ℃ of conditions, and survey requirement is the 24h no change;
Humidity resistance detects at 47 ± 1 ℃, carries out under 96 ± 2% humidity conditions, and survey requirement is that 1000h passes through;
Salt fog resistance detects and adopts 50g/l ± 10g/lNaCl, PH=6.5～7.2, and temperature is to carry out under 35 ± 2 ℃ of conditions, survey requirement is that 1000h passes through;
It is 1 grade that the fungus resistance class inspection requires;
The artificial ageing resistance test adopts QUV (UV-light deterioration accelerator) to carry out, and survey requirement is that 1000h passes through.
Table 1 (the test rating contrast table of filming)
Annotate: every index operative norm is relevant GB (GB)
From table 1 result as can be seen, the metal surface anti-corrosion layer structure of the embodiment of the invention is with respect to Comparative Examples 1, its antiseptic property, ageing resistance, mechanical property improve a lot, and can meet the requirement of marine severe environment protecting metallic surface.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. metal surface anti-corrosion layer structure, comprise the prime coat that from inside to outside is coated on the metallic surface, middle enamelled coating and top coat layer three coatings, it is characterized in that, described prime coat thickness is 40～80 μ m, described intermediate coat layer thickness is 50～100 μ m, described top coat layer thickness is 40～80 μ m, wherein, prime coat is applied by epoxy-polymeric amide affixture system coating and forms, middle enamelled coating is applied by thick paste type epoxy-polymeric amide affixture system coating and forms, and top coat layer is applied by acroleic acid polyurethane system coating and forms.
2. metal surface anti-corrosion layer structure as claimed in claim 1 is characterized in that, described prime coat thickness is 60～70 μ m, and described intermediate coat layer thickness is 70～80 μ m, and described top coat layer thickness is 70～80 μ m.
3. the anticorrosion coating method in metallic surface is characterized in that, comprises the steps:
Epoxy-polymeric amide affixture system coating is applied in the metallic surface, form the prime coat that a layer thickness is 40～80 μ m;
Thick paste type epoxy-polymeric amide affixture system coating is applied above described prime coat, and forming a layer thickness is the middle enamelled coating of 50～100 μ m;
Acroleic acid polyurethane system coating is applied above described middle enamelled coating, form the top coat layer that a layer thickness is 40～80 μ m.
4. as the anticorrosion coating method in metallic surface as described in the claim 3, it is characterized in that described epoxy-polymeric amide affixture system coating is that 2: 1～4: 1 Resins, epoxy and polymeric amide preparation forms by weight ratio; Described thick paste type epoxy-polymeric amide affixture system coating is that 2: 1～4: 1 thick paste type epoxy resin and polymeric amide preparation form by weight ratio; Described acroleic acid polyurethane system coating is that 5: 1～7: 1 vinylformic acid and urethane is formulated by weight ratio.
5. as the anticorrosion coating method in metallic surface as described in the claim 4, it is characterized in that described epoxy-polymeric amide affixture system coating is that 3: 1 Resins, epoxy and polymeric amide preparation forms by weight ratio; Described thick paste type epoxy-polymeric amide affixture system coating is that 3: 1 thick paste type epoxy resin and polymeric amide preparation form by weight ratio; Described acroleic acid polyurethane system coating is that 7: 1 vinylformic acid and urethane is formulated by weight ratio.
6. as the anticorrosion coating method in metallic surface as described in the claim 3, it is characterized in that: remove substrate surface grease and impurity earlier; At the metal base surface sanding, derusting grade is to Sa 2.5～3.0 then.
7. as the anticorrosion coating method in metallic surface as described in the claim 3, it is characterized in that, wherein, add the thinner that is no more than this coating gross weight 20% in described each coating.
8. as the anticorrosion coating method in metallic surface as described in the claim 7, it is characterized in that described thinner is one or more the combination among dimethylbenzene, toluene, butanols, ethanol, propyl alcohol, Virahol, N-BUTYL ACETATE, vinyl acetic monomer, pimelinketone, butanone, acetone, ethylene glycol monomethyl ether, ethylene glycol ethyl ether, butyl glycol ether and the DBE.
9. as the anticorrosion coating method in metallic surface as described in the claim 3, it is characterized in that described metal is a non-ferrous metal.
10. as the anticorrosion coating method in metallic surface as described in the claim 3, it is characterized in that, can adopt spraying, brushing and roll coating model to apply.
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