CN102911534B - Water base non-chrome zinc-aluminium coating and methods for preparing and using same - Google Patents
Water base non-chrome zinc-aluminium coating and methods for preparing and using same Download PDFInfo
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Abstract
The invention relates to a water base non-chrome zinc-aluminium coating and methods for preparing and using the same. The coating is prepared by proportionally mixing a component A and a component B; the component A contains 50-150g/L of lamellar metal powder, 145-290ml/L of organic solvent, 10-200ml/L of deionized water, 10-36ml/L of reducing agent and 5-15ml/L of wetting agent; and the component B contains 60-240ml/L of deionized water, 20-75ml/L of binding agent, 8-22ml/L of thickening agent, 4-8ml/L of silicon compound and the balance of the organic solvent. The method for preparing the water base non-chrome zinc-aluminium coating comprises the steps of: weighing the lamellar metal powder proportionally to be mixed uniformly, and then adding the organic solvent to be mixed uniformly for later use; mixing the reducing agent with the wetting agent, adding an appropriate amount of the deionized water to be mixed uniformly, and then adding the lamellar metal powder liquid to prepare the component A; proportionally weighing the thickening agent, the binding agent and the silicon compound, and adding the organic solvent to be mixed uniformly to prepare the component B; and mixing the prepared component A and the prepared component B according to the ratio of 2:1, and stirring unit uniform, thus obtaining the coating. The method for using the water base non-chrome zinc-aluminium coating is that the coating is coated on a part to be treated, and the baking temperature is increased to 360 DEG C so as to solidify and crosslink the coating to form a dense protective layer. The coating has the corrosion resistance which reaches 840 hours of a neutral salt spray test and over 96 hours of a heat resistance test, the usage amount of harmful substances is greatly reduced, and the working environment is improved.
Description
Technical field
The invention belongs to Metal surface anti-corrosion processing technology field, relate to a kind of water base Non-chromium Zn-al Coating and preparation method thereof.
Background technology
Along with Ministry of Aeronautics Industry in 1993, Dacromet was introduced China from Japan by first, and zinc-aluminium chromium film (being commonly called as Dacroment film) technology starts application and development at home.Because Dacromet Technology has without hydrogen embrittlement, pollutes the advantages such as little, corrosion resistance is good, 1996, Dacroment is classified as cleaner production emphasis and subsidizes exploration project by Ministry of Machine-Building Industry, 1999, Dacroment is classified as best practical technology of environmental protection in China by State Environmental Protection Administration, and nowadays it has become the focus that various places electro dipping industry is recommended.
But along with increasingly strict to the raising of environmental requirement and National Environmental policy of people, because containing the contour poison of chromic anhydride, high carcinogen, make it can produce certain harm to workman and natural environment unavoidably in production application in traditional Dacroment masking liquid.In order to tackle the new environmental protection trend of plating, developing a kind of not chromyl novel environment friendly treatment technology and replacing Dacroment just to become the study hotspot in Metal surface anti-corrosion field.
Under these circumstances, engender chromium-free zinc aluminum anticorrosive paint, as No. 201010227660.5 application discloses a kind of chromium-free zinc aluminum anticorrosive paint and preparation method.Its technical scheme is: first stirred by the flakey aluminium powder of the flake zinc powder of 5 ~ 25wt% and 5 ~ 15wt%, add the inorganic additive of the organic solvent of 25 ~ 40wt%, the dispersant of 1.1 ~ 1.8wt%, the corrosion inhibiter of 3 ~ 8wt% and 3 ~ 10wt% again, stir 20 ~ 40min, make base-material.Then add in base-material after the organic solvent of the modified resin of 5 ~ 15wt%, the organo silane coupling agent of 1 ~ 3wt% and 25 ~ 30wt% being stirred.Or stir 30 ~ 50min, obtained chromium-free zinc aluminum anticorrosive paint, or stir 30 ~ 50min, then add the hydroxyethylcellulose of 0.05 ~ 0.5wt%, stir 20 ~ 50min, obtained chromium-free zinc aluminum anticorrosive paint.But what this technology adopted is dissolved as organic solvent, volatile, its toxicity is comparatively large, inadequate environmental protection, and due to its high volatility, its resting period is unsuitable long.
No. 201110352167.0 is separately had to application discloses a kind of aqueous chromium-free zinc-aluminum paint, it is mixed the A agent and B agent of mixing well when comprising use, with the total weight of A agent and B agent for 100%, A agent comprises the component of following weight percents: emulsifying agent: 1%-5%, alcohol: 10%-25%, defoamer: 0%-5%, thickener: 0%-0.3%, metallic zinc aluminium powder or zinc-aluminium cream: 25%-35%; Described B agent comprises the component of following weight percents: deionized water: 20%-40%, silane coupler: 10%-20%.This aqueous chromium-free zinc-aluminum paint, non-hexavalent chromium and lead, mercury, cadmium heavy metal ion compound, not containing the toxic organic solvents such as benzene, dimethylbenzene, coating curing temperatures is 250-300 DEG C, 20 minutes, shortens the time widely.But the embodiment described in this technology needs to add defoamer, illustrate that this formula can produce a large amount of bubbles in the process implemented, this can cause painting membrane closure bad, and bubble easily causes paint film defect, thus affects antiseptic property.
In view of above-mentioned, the research of chromium-free zinc aluminum anticorrosive paint waits further exploitation.
Summary of the invention
The present invention, in order to solve the above-mentioned existing deficiency without zinc-aluminium chromium membrane technology, by carefully studying the anticorrosion mechanism of zinc-aluminium chromium film masking liquid, proposes a kind ofly to abandon chromic anhydride, the water base chromium-free zinc aluminum masking liquid selecting environment friendly and pollution-free material and preparation method thereof.
The present invention is achieved by the following scheme:
Above-mentioned water base chromium-free zinc aluminum masking liquid, is made up of component A and B component; Described component A and B component by volume 2:1 ratio mixing; Described component A is mixed by following component: content is the wetting agent of the flake metal powder of 50-150g/L, 145-290ml/L organic solvent, the deionized water of 100-200ml/L, the reducing agent of 10-36ml/L and 5-15ml/L; Described B component is mixed by following component: content is the organic solvent of the deionized water of 60-240ml/L, the binding agent of 20-75ml/L, the thickener of 8-22ml/L, the silicon-containing compound of 4-8ml/L and surplus.
Described water base chromium-free zinc aluminum masking liquid, wherein: described flake metal powder comprises zinc powder, aluminium powder, and the mass ratio of described zinc powder and aluminium powder is 5:1.Described organic solvent be boiling point about 200 DEG C n-butanol, ethylene glycol, ethyl acetate, acetone or halogenated hydrocarbons.Described thickener is sodium hydroxyethyl cellulose, three glycerine, polypropylene glycol or diethylene glycol ethers.Described reducing agent comprises n-butanol, ethylene glycol, glycerine and isopropyl alcohol, preferred n-butanol.Described wetting agent is OP-10, dodecyl sodium sulfate or zinc stearate.Described binding agent is organic resin.Described silicon-containing compound comprises ethyl orthosilicate and silane.
The preparation method of described water base chromium-free zinc aluminum film masking liquid: add organic solvent after taking a certain amount of flake zinc powder and aluminium powder mixing by proportioning and stir, stand-by; By reducing agent and wetting agent mixing, add appropriate deionized water and stirring evenly, and then add the flake metal powder slurries mixed before this, make component A; Take a certain amount of thickener, bonding agent and silicon-containing compound in proportion, add after organic solvent stirs, make B component; Obtained component A and B component are mixed in the ratio of 2:1, stirs until evenly, i.e. obtained water base chromium-free zinc aluminum film masking liquid.
The using method of described water base chromium-free zinc aluminum film masking liquid: the sticky situation according to masking liquid during use judges whether to add thickener; if add thickener, continue stirring 1 ~ 2 h; then this water base chromium-free zinc aluminum film liquid is coated on pending part; by improving baking temperature to 360 DEG C; make chromium-free zinc aluminum membrane coat curing cross-linked, form the protective layer of one deck densification.
Beneficial effect:
This chromium-free zinc aluminum membrane technology has following technical characterstic:
(1) physical isolation protective effect: the flake metal powder be layering is combined closely by the complex oxide generated in sintering process and formed the overcoat of compact and firm, thus well can play the effect of isolation corrosive medium;
(2) electro-chemical protection: the electrode potential of iron is-0.44V, zinc be-0.7628V, aluminium be-1.66V, the zinc in such coating and aluminium can form galvanic cell with iron matrix, and they will preferentially be corroded; Further, low than zinc of the electrode potential of aluminium, aluminium can play inhibitory action to the consumption of zinc again; In addition, the corrosion potential of coating is about-0.76V, and corrosion current is very low, and disruptive potential is about-0.05V, and breakdown difficulty is very large, and its corrosion electric current density is about 0.17u A/cm, therefore the corrosion resistant persistence of coating is very strong;
(3) environmental-protection function: chromium-free zinc aluminum membrane coat all makees solvent with water, not with an organic solvent, not containing poisonous metal (as nickel, lead, chromium) etc., meets the environmental regulation requirement of US and European;
(4) without hydrogen embrittlement: in zinc-aluminum film technical finesse process, pickling-free, electroless deposition are without operations such as electrolytic degreasings, electrogalvanizing process is not just had to cause the electrochemical reaction of liberation of hydrogen yet, so material can not be made to produce hydrogen embrittlement.Therefore the workpiece processing elastic part and high strength is particularly suitable for;
(5) high-fire resistance: establishing criteria Q/DFLY1020-2008 checks, quenching is without peeling off after 550 DEG C of bakings for coating, and without bulge, without bottom drain, carry out neutral salt spray test after baking, corrosion resistance was more than 96 hours.
This technology corrosion resistance reaches neutral salt spray test 840h, and heat-resistance test is more than 96h, and be in a leading position level at home.On the parts such as vehicle exhaust system, application can produce huge economic benefit, significantly reduces the use amount of harmful substance, improves working environment.
Detailed description of the invention
Water base Non-chromium Zn-al Coating of the present invention, mainly comprises flake metal powder, solvent, reducing agent, thickener, wetting agent, binding agent and silicon-containing compound, is specifically made up of component A and B component, and the volume ratio of component A and B component is 2:1;
Wherein component A is mixed by following component: content is the wetting agent of the flake metal powder of 50-150g/L, 145-290ml/L organic solvent, the deionized water of 100-200ml/L, the reducing agent of 10-36ml/L and 5-15ml/L;
B component is mixed by following component: content is the organic solvent of the deionized water of 60-240ml/L, the binding agent of 20-75ml/L, the thickener of 8-22ml/L, the silicon-containing compound of 4-8ml/L and surplus; Add silicon-containing compound in B component, effectively improve masking liquid viscosity, add the corrosion resistance of coating.Because after solution mixing, volume changes, so surplus is organic solvent.
Flake metal powder is the Main Ingredients and Appearance of zinc-chromium coating, and content is no less than 50g/L; Mainly contain zinc, aluminium, magnesium, manganese etc. and they obscure thing or alloy flakey superfine powder; Zinc flake and aluminium powder the most frequently used, mutually adjoin with flake metal powder and overlap together, form the squamous maintenance level of tens of layers with the form of face, face overlap in the appearance of metallic matrix, metallic matrix is played to the electrochemistry shielding effect of sacrificial anode; When flake metal powder is mixed by zinc powder and aluminium powder, the mass ratio of zinc powder and aluminium powder is 5:1.
Organic solvent is usually also with water miscible, and available boiling point is at the n-butanol, ethylene glycol, ethyl acetate, acetone, halogenated hydrocarbons etc. of about 200 DEG C.
The effect of reducing agent enters in bake oven grilling knot course at workpiece, facilitates hexavalent chrome reduction in coating be trivalent chromium and assure the quality of rete, forms the compound adhesive linkage of inorganic chromium, can select n-butanol, ethylene glycol, glycerine, isopropyl alcohol etc.
Thickener, for ensureing that masking liquid does not disorderly drip and adds in masking liquid, can select sodium hydroxyethyl cellulose, three glycerine, polypropylene glycol, diethylene glycol ethers etc.
Wetting agent is a class surface reactive material, available OP-10, dodecyl sodium sulfate, zinc stearate etc.
Binding agent can select the organic resin such as bisphenol A epoxide resin, silane coupler.
Silicon-containing compound comprises ethyl orthosilicate and silane, and silane is as methyl-monosilane, diphenyl silane etc.
The preparation method of water base chromium-free zinc aluminum film masking liquid of the present invention:
Add organic solvent after taking a certain amount of flake zinc powder and aluminium powder mixing by proportioning to stir, stand-by; By reducing agent and wetting agent mixing, add appropriate deionized water and stirring evenly, and then add the flake metal powder slurries mixed before this, make component A;
Take a certain amount of thickener, bonding agent and silicon-containing compound in proportion, add after organic solvent stirs, make B component;
The ratio mixing of A, B component 2:1 by volume, stirs until evenly, i.e. obtained water base chromium-free zinc aluminum film masking liquid.
The using method of water base chromium-free zinc aluminum film masking liquid of the present invention:
Sticky situation according to masking liquid during use judges whether to add thickener; if add thickener, continue stirring 1 ~ 2 h; then this water base chromium-free zinc aluminum film liquid is coated on pending part; by improving baking temperature to 360 DEG C; make chromium-free zinc aluminum membrane coat curing cross-linked, form the protective layer of one deck densification.
Below in conjunction with specific embodiment, the present invention is further described:
Embodiment 1
Take 100g flake zinc powder, 20g aluminium powder and 30g magnesium powder, add after mixing in 600 ml organic solvent n-butanols, stir, stand-by; 300ml deionized water and stirring is added even after getting reducing agent n-butanol 60ml, OP-10 wetting agent 30ml mixing, and then add the flake metal powder slurries mixed before this, with high speed dispersor (rotating speed 700 revs/min) fully wetting and dispersing to homogeneous phase to protect coating without granule polymer, make component A;
Remove ionized water 720ml, add 60ml bisphenol A epoxide resin and 66ml sodium hydroxyethyl cellulose, stir 2 hours with homogenizer, binding agent is fully disperseed, add n-butanol again, stir 1 hour, mix, add containing ethyl orthosilicate 15ml, after stirring, make B component;
By the ratio mixing of obtained A, B component 2:1 by volume, stir until evenly, i.e. obtained water base chromium-free zinc aluminum film masking liquid.
Obtained water base chromium-free zinc aluminum film masking liquid being overlying on pending part, by improving baking temperature to 360 DEG C, making chromium-free zinc aluminum membrane coat curing cross-linked, form the protective layer of one deck densification.
Water base Non-chromium Zn-al Coating obtained by the present embodiment, through experiment test, adhesive force is good, and tape test coating, without peeling off, does not expose matrix.The heat resistant test time is 36-42 hour, and the neutral salt spray test time reaches 492-502 hour.
Embodiment 2
Take 125g flake zinc powder and 25g aluminium powder, add after mixing in 290ml organic solvent ethylene glycol, stir, stand-by; 130ml deionized water and stirring is added even after getting reducing agent ethylene glycol 36ml, OP-10 wetting agent 12ml mixing, and then add the flake metal powder slurries mixed before this, with high speed dispersor (rotating speed 700 revs/min) fully wetting and dispersing to homogeneous phase to protect coating without granule polymer, make component A;
Remove ionized water 60ml, add 45ml bisphenol A epoxide resin and 15ml thickener three glycerine, stir 2 hours with homogenizer, binding agent is fully disperseed, add ethylene glycol again, stir 1 hour, mix, add ethyl orthosilicate 4ml, after stirring, make B component;
By the ratio mixing of obtained A, B component 2:1 by volume, stir until evenly, i.e. obtained water base chromium-free zinc aluminum film masking liquid.
Obtained water base chromium-free zinc aluminum film masking liquid being overlying on pending part, by improving baking temperature to 360 DEG C, making chromium-free zinc aluminum membrane coat curing cross-linked, form the protective layer of one deck densification.
Water base Non-chromium Zn-al Coating obtained by the present embodiment, through experiment test, adhesive force is good, and tape test coating, without peeling off, does not expose matrix.The heat resistant test time is 42-48 hour, and the neutral salt spray test time reaches 482-490 hour.
Embodiment 3
Take 100g flake zinc powder and 20g aluminium powder, add after mixing in 180ml organic solvent ethyl acetate, stir, stand-by; 200ml deionized water and stirring is added even after getting reducing agent glycerine 10ml, dodecyl sodium sulfate wetting agent 5ml mixing, and then add the flake metal powder slurries mixed before this, with high speed dispersor (rotating speed 700 revs/min) fully wetting and dispersing to homogeneous phase to protect coating without granule polymer, make component A;
Remove ionized water 200ml, add 75ml silane coupler and 8ml thickener polypropylene glycol, stir 2 hours with homogenizer, binding agent is fully disperseed, add ethyl acetate again, stir 1 hour, mix, add methyl-monosilane 6ml, after stirring, make B component;
By the ratio mixing of obtained A, B component 2:1 by volume, stir until evenly, i.e. obtained water base chromium-free zinc aluminum film masking liquid.
Obtained water base chromium-free zinc aluminum film masking liquid being added thickening 10ml, stirs 1h, be overlying on pending part, by improving baking temperature to 360 DEG C, making chromium-free zinc aluminum membrane coat curing cross-linked, form the protective layer of one deck densification.
Water base Non-chromium Zn-al Coating obtained by the present embodiment, through experiment test, adhesive force is good, and tape test coating, without peeling off, does not expose matrix.The heat resistant test time is 42-46 hour, and the neutral salt spray test time reaches 496-514 hour.
Embodiment 4
Take 30g flake zinc powder, 6g aluminium powder and 14g manganese powder, add after mixing in 145ml organic solvent-acetone, stir, stand-by; 200ml deionized water and stirring is added even after getting reducing agent n-butanol 12ml, zinc stearate wetting agent 6ml mixing, and then add the flake metal powder slurries mixed before this, with high speed dispersor (rotating speed 700 revs/min) fully wetting and dispersing to homogeneous phase to protect coating without granule polymer, make component A;
Remove ionized water 220ml, add 50ml silane coupler and 9ml diethylene glycol ethers, stir 2 hours with homogenizer, binding agent is fully disperseed, then adds acetone, stir 1 hour, mix, add methyl-monosilane 8ml, after stirring, make B component;
By the ratio mixing of obtained A, B component 2:1 by volume, stir until evenly, i.e. obtained water base chromium-free zinc aluminum film masking liquid.
Obtained water base chromium-free zinc aluminum film masking liquid being added thickener 15ml, stirs 2 h, be overlying on pending part, by improving baking temperature to 360 DEG C, making chromium-free zinc aluminum membrane coat curing cross-linked, form the protective layer of one deck densification.
Water base Non-chromium Zn-al Coating obtained by the present embodiment, through experiment test, adhesive force is good, and tape test coating, without peeling off, does not expose matrix.The heat resistant test time is 42-46 hour, and the neutral salt spray test time reaches 496-514 hour.
Embodiment 5
Take 50g flake zinc powder, 10g magnesium powder and 20g manganese powder, add after mixing in 145ml organic solvent halogenated hydrocarbons, stir, stand-by; 200ml deionized water and stirring is added even after getting reducing agent n-butanol 12ml, zinc stearate wetting agent 6ml mixing, and then add the flake metal powder slurries mixed before this, with high speed dispersor (rotating speed 700 revs/min) fully wetting and dispersing to homogeneous phase to protect coating without granule polymer, make component A;
Remove ionized water 220ml, add 50ml bisphenol A epoxide resin and 9ml sodium hydroxyethyl cellulose thickener, stir 2 hours with homogenizer, binding agent is fully disperseed, add halogenated hydrocarbons again, stir 1 hour, mix, add diphenyl silane 8ml, after stirring, make B component;
By the ratio mixing of obtained A, B component 2:1 by volume, stir until evenly, i.e. obtained water base chromium-free zinc aluminum film masking liquid.
Obtained water base chromium-free zinc aluminum film masking liquid being added thickener 15ml, stirs 1.5 h, be overlying on pending part, by improving baking temperature to 360 DEG C, making chromium-free zinc aluminum membrane coat curing cross-linked, form the protective layer of one deck densification.
Water base Non-chromium Zn-al Coating obtained by the present embodiment, through experiment test, adhesive force is good, and tape test coating, without peeling off, does not expose matrix.The heat resistant test time is 42-46 hour, and the neutral salt spray test time reaches 496-514 hour.
Embodiment six
By ratio of weight and the number of copies, remove ionized water 15 parts, take 6 parts of flake zinc powders and 1.5 parts of aluminium powders, add after mixing, get 14.5 parts of organic solvents, add the zinc powder that mixes and aluminium powder stirs, stand-by.Get reducing agent isopropyl alcohol 0.1 part, add 0.26 part of deionized water and stirring after wetting agent 0.03 part mixing evenly, and then add the flake metal powder slurries mixed before this, make component A; With high speed dispersor (rotating speed 700 revs/min), fully wetting and dispersing is to homogeneous phase, and guarantor's coating is without granule polymer;
By ratio of weight and the number of copies, remove ionized water 10 parts, add binding agent thickener 8.75 parts, stir 2 hours with homogenizer, binding agent is fully disperseed, add reducing agent 2 parts again, add deionized water 10 parts, stir 1 hour, mix, add silicon-containing compound 1 part, after stirring, make B component;
Obtained A, B component are mixed in the ratio of 2:1, stirs until evenly, i.e. obtained water base chromium-free zinc aluminum film masking liquid.
Obtained water base chromium-free zinc aluminum film masking liquid being overlying on pending part, by improving baking temperature to 360 DEG C, making chromium-free zinc aluminum membrane coat curing cross-linked, form the protective layer of one deck densification.
Water base Non-chromium Zn-al Coating obtained by the present embodiment, through experiment test, adhesive force is good, and tape test coating, without peeling off, does not expose matrix.The heat resistant test time is 42-46 hour, and the neutral salt spray test time reaches 496-514 hour.
The water base Non-chromium Zn-al Coating of the various embodiments described above is as follows through the method for testing of experiment test:
1. the preparation of test sample plate
Employing cold-rolled low carbon steel is matrix material, is of a size of 40 mm × 40mm × 4 mm.Matrix, through 80-90 DEG C of alkali cleaning oil removing, subsequently, is frustrated four limits with file, then is used 0
#sand paper (cloth) manual polishing, to exposing greyish white iron-based (activation), is at one end made a call to a Φ 6mm hole, is put into drier for subsequent use with soft paper bag after covering.
2, heat resistant test
By quenching after 600 DEG C, the sample heating 0.5h of this coating process, calculate the test period that a red rust point appears in gas meter face.
3. adhesion test
Adhesion test adopts cross-hatching with reference to GB/T 5270-2005, draws the square lattice of 1 mm, then tears behind grid place with adhesive tape sticking, observe coating stripping situation with the hard steel knife that the edge of a knife is sharp in coating.
4. neutral salt spray test (NSS)
Perform GB GB/T 10125-1997, to occur that a red rust point is for termination test hourage.
Chromium-free zinc aluminum membrane technology of the present invention has following technical characterstic:
1, physical isolation protective effect: the flake metal powder be layering is combined closely by the complex oxide generated in sintering process and formed the overcoat of compact and firm, thus well can play the effect of isolation corrosive medium;
2, electro-chemical protection: the electrode potential of iron is-0.44V; zinc be-0.7628V; aluminium be-1.66V; zinc in such coating and aluminium can form galvanic cell with iron matrix; they will preferentially be corroded; further, low than zinc of the electrode potential of aluminium, aluminium can play inhibitory action to the consumption of zinc again.In addition, the corrosion potential of coating is about-0.76V, and corrosion current is very low, and disruptive potential is about-0.05V, and breakdown difficulty is very large, and its corrosion electric current density is about 0.17u A/cm, therefore the corrosion resistant persistence of coating is very strong;
3, environmental-protection function: chromium-free zinc aluminum membrane coat all makees solvent with water, not with an organic solvent, not containing poisonous metal (as nickel, lead, chromium) etc., meets the environmental regulation requirement of US and European;
4, without hydrogen embrittlement: in zinc-aluminum film technical finesse process, pickling-free, electroless deposition are without operations such as electrolytic degreasings, electrogalvanizing process is not just had to cause the electrochemical reaction of liberation of hydrogen yet, so material can not be made to produce hydrogen embrittlement.Therefore the workpiece processing elastic part and high strength is particularly suitable for;
5, high-fire resistance: establishing criteria Q/DFLY1020-2008 checks, quenching is without peeling off after 550 DEG C of bakings for coating, and without bulge, without bottom drain, carry out neutral salt spray test after baking, corrosion resistance was more than 96 hours.
Coating technology corrosion resistance of the present invention reaches neutral salt spray test 840h, and heat-resistance test is more than 96h, and be in a leading position level at home; Significantly can reduce the use amount of harmful substance, improve working environment.
Claims (3)
1. a water base chromium-free zinc aluminum film masking liquid, is made up of component A and B component; It is characterized in that: described component A and B component by volume 2:1 ratio mixing;
Described component A is mixed by following component: content is the wetting agent of the flake metal powder of 50-150g/L, 145-290ml/L organic solvent, the deionized water of 100-200ml/L, the reducing agent of 10-36ml/L and 5-15ml/L;
Described B component is mixed by following component: content is the organic solvent of the deionized water of 60-240ml/L, the binding agent of 20-75ml/L, the thickener of 8-22ml/L, the silicon-containing compound of 4-8ml/L and surplus;
Described flake metal powder comprises zinc powder, aluminium powder, and the mass ratio of described zinc powder and aluminium powder is 5:1;
Described organic solvent is n-butanol, ethylene glycol, ethyl acetate, acetone or halogenated hydrocarbons;
Described thickener is sodium hydroxyethyl cellulose, three glycerine, polypropylene glycol or diethylene glycol ethers;
Described reducing agent is n-butanol;
Described wetting agent is OP-10, dodecyl sodium sulfate or zinc stearate;
Described binding agent is bisphenol A epoxide resin or silane coupler;
Described silicon-containing compound comprises ethyl orthosilicate and silane, and described silane is methyl-monosilane or diphenyl silane.
2. the preparation method of water base chromium-free zinc aluminum film masking liquid as claimed in claim 1:
Add organic solvent after taking a certain amount of flake zinc powder and aluminium powder mixing by proportioning to stir, stand-by; By reducing agent and wetting agent mixing, add appropriate deionized water and stirring evenly, and then add the flake metal powder slurries mixed before this, make component A;
Take a certain amount of thickener, bonding agent and silicon-containing compound in proportion, add after organic solvent stirs, make B component;
By the ratio mixing of obtained component A and B component 2:1 by volume, stir until evenly, i.e. obtained water base chromium-free zinc aluminum film masking liquid.
3. the using method of water base chromium-free zinc aluminum film masking liquid as claimed in claim 1: the sticky situation according to masking liquid during use judges whether to add thickener; if add thickener, continue stirring 1 ~ 2h; then this water base chromium-free zinc aluminum film liquid is coated on pending part; by improving baking temperature to 360 DEG C; make chromium-free zinc aluminum membrane coat curing cross-linked, form the protective layer of one deck densification.
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