CN104070000B - A kind of coating process keeping aluminium alloy tank car primary colors - Google Patents
A kind of coating process keeping aluminium alloy tank car primary colors Download PDFInfo
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- CN104070000B CN104070000B CN201310107941.0A CN201310107941A CN104070000B CN 104070000 B CN104070000 B CN 104070000B CN 201310107941 A CN201310107941 A CN 201310107941A CN 104070000 B CN104070000 B CN 104070000B
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Abstract
The present invention relates to the field of coating of aluminium alloy tank car, be specifically related to a kind of coating process keeping aluminium alloy tank car primary colors.The coating process of this maintenance aluminium alloy tank car primary colors, it comprises the following steps: step one, Coating Pretreatment; The reparation at step 2, aluminum alloy substrate open defect position; Step 3, application varnish.The coating process of maintenance aluminium alloy tank car primary colors provided by the invention can repair scratch, scratching, the open defect such as blackening and corrosion of aluminum alloy surface, the aluminium alloy cell body of aluminium alloy tank car and aluminium alloy part can be made again to keep the metallic luster of original uniqueness, and the self-control repair layer coating coated by this coating process and self-control aluminium alloy special coating have excellent adhesive force, weatherability; And self-control aluminium alloy special coating has high transparent, makes whole Al alloy parts surface presentation high glaze, thus makes the color on whole Al alloy parts surface and glossiness present homogeneous effect.
Description
Technical field
The present invention relates to the field of coating of aluminium alloy tank car, be specifically related to a kind of coating process keeping aluminium alloy tank car primary colors.
Background technology
Aluminium alloy tank car is generally used for transporting oil products, liquid chemical product and water etc., and its cell body and parts all adopt aluminium alloy manufacture.Because aluminum alloy material has the metallic luster that excellent antiseptic property and film cannot represent, so aluminium alloy tank car is when dispatching from the factory mostly, manufacturer does not carry out application to aluminium alloy cell body and aluminium alloy part, but the original color and luster of maintenance aluminium alloy.The outward appearance of user to this aluminium alloy tank car is also felt quite pleased, and specifies the aluminium alloy tank car wanting aluminium alloy primary colors in purchase contract book.
But, aluminium alloy cell body and aluminium alloy part in process often because of a variety of causes causes cut, scratches, blackening and corrosion etc. affect presentation quality problem.And, in the use procedure of aluminium alloy tank car, aluminium alloy cell body and aluminium alloy part also can oxidation stains, also be easy to adsorb spot, general cleaning method is difficult to remove these dirts, and strong base cleaning agent must be used just to clean up, but strong base cleaning agent is easy to corrode aluminum alloy substrate, and cause that Al-alloy based basal surface is uneven to turn white, have a strong impact on the attractive in appearance of aluminium alloy tank car.In some climatic environment, aluminium alloy also can produce etching problem, as acid rain, the climatic environment such as coastal can cause certain corrosion to aluminium alloy.In certain weather conditions, aluminium alloy tank car must carry out the service life of application guarantee product, and such as in Japan, laws and regulations requirement aluminium alloy tank car must carry out application before dispatching from the factory; Be used for the tank car of transporting food products oil in the Northeast of China because often cleaning with strong base cleaning agent, aluminium alloy tank car also requires before dispatching from the factory must application.
Because aluminum alloy material surface compact is smooth, and the degree of deformation that aluminum alloy material expands with heat and contract with cold is very large, so general coating is very poor to the adhesive force in aluminum alloy substrate.In existing application techniques, in order to improve the adhesive force of coating in aluminum alloy surface, spray last as the techniques such as anodic oxidation, phosphatization, pickling and network can be adopted to spray as aluminium alloy pre-treatment, and the epoxy coating using adhesive force excellent is as priming paint.But these process of surface treatment above-mentioned make aluminum alloy surface lose the metallic luster of cold rolling had uniqueness; In addition, epoxy resin in epoxy primer not UV resistant irradiates, covering power of must arranging in pairs or groups during outdoor use and ultra-violet resistance can be good service life of topcoat guarantee epoxy primer, and the topcoat with good covering power also can cover aluminum alloy substrate completely, thus Al-alloy based basal surface is caused to lose the gloss of original uniqueness.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of coating process keeping aluminium alloy tank car primary colors is provided, the coating process of this maintenance aluminium alloy tank car primary colors can repair scratch, scratching, the open defect such as blackening and corrosion of aluminum alloy surface, the aluminium alloy cell body of aluminium alloy tank car and aluminium alloy part can be made again to keep the metallic luster of original uniqueness, and the self-control aluminium alloy special coating coated by this coating process have excellent adhesive force, weatherability and the transparency.
To achieve these goals, the present invention adopts following technical scheme:
Keep a coating process for aluminium alloy tank car primary colors, it comprises the following steps:
Step one, Coating Pretreatment:
A, tear the processing diaphragm on Al alloy parts surface;
B, use Tianna solution wiping Al alloy parts surface;
C, again use dry powder wiping Al alloy parts surface;
D, manufacture rough surface: slightly polish on Al alloy parts surface with the scouring pad rotated;
E, pickling, washing: the position having black oxide with sour cream coated aluminium alloy surface of the work, then rinse whole Al alloy parts surface with clear water;
F, the whole Al alloy parts surface of use aluminium alloy special degreaser wiping;
The reparation at step 2, aluminum alloy substrate open defect position:
A, self-control repair layer coating: in self-control aluminium alloy special coating, add aluminium powder, the metallic paint of imitative aluminium sheet color is obtained after stirring under normal temperature, then the color of described metallic paint and the color of aluminum alloy substrate are contrasted, add inorganic mill base according to the extent of deviation of color and obtain repair layer coating, with the solid colour of the color and aluminum alloy substrate of guaranteeing repair layer coating;
B, spraying repair layer coating: position repair layer spray painting being existed in aluminum alloy substrate open defect, the thickness of the repair layer coating of required spraying is 10 μm ~ 15 μm;
Step 3, application varnish:
A, by whole Al alloy parts surface spraying self-control aluminium alloy special coating;
B, dry solidification is carried out to the repair layer coating and self-control aluminium alloy special coating that are sprayed at Al alloy parts surface;
Wherein, described self-control aluminium alloy special coating is made up of organic-silicon-modified resin, adhesion promoter, levelling agent and defoamer; The quality of described adhesion promoter, described levelling agent and described defoamer accounts for 0.1% ~ 0.5% of the quality of described organic-silicon-modified resin respectively;
Wherein, described organic-silicon-modified resin is organosilicon modified crylic acid resin or organic silicon modified polyurethane resin;
In technique scheme, the sour cream in the step e in described step one Coating Pretreatment is made up of the raw material of following weight portion:
35 parts ~ 45 parts, nitric acid (mass percentage concentration 67%)
4 parts ~ 7 parts, hydrofluoric acid (mass percentage concentration 47%)
Phosphoric acid (mass percentage concentration 85%) 22 parts ~ 28 parts
Bentonite 130 parts ~ 150 parts
Sodium phosphate 8 parts ~ 13 parts
90 parts ~ 110 parts, water;
Wherein, described bentonitic particle size is 100 order ~ 200 orders.
Preferably, described sour cream is made up of the raw material of following weight portion:
42 parts, nitric acid (mass percentage concentration 67%)
6 parts, hydrofluoric acid (mass percentage concentration 47%)
Phosphoric acid (mass percentage concentration 85%) 26 parts
Bentonite 140 parts
Sodium phosphate 10 parts
100 parts, water.
In technique scheme, the special degreaser of described aluminium alloy is mixed with the mass ratio of 1:1:1 by chlorinated polyvinyl chloride, carrene and acetone.
In technique scheme, the quality of described aluminium powder accounts for 8% ~ 12% of the quality of described repair layer coating, and the quality of described inorganic mill base accounts for 0.5% ~ 3% of the quality of described repair layer coating.
Wherein, described inorganic mill base refers to that the various looks that car paint is conventional are female, and its color composition is the pigment such as carbon black, rutile type titanium white, iron oxide red, phthalocyanine blue, specifically selects according to the color of aluminum alloy substrate.
The particle size of described aluminium powder is 200 order ~ 400 orders.
In technique scheme, in step 2 and step 3, before spraying repair layer coating and self-control aluminium alloy special coating, need add curing agent polyamide, polyamide is 1:3 or 1:5 with the mass ratio of self-control aluminium alloy special coating.
Be sprayed at the repair layer coating on Al alloy parts surface and self-control aluminium alloy special coating when carrying out dry solidification, solidification temperature is lower 25 DEG C of room temperature, and the completely crued time is 24 hours.
Be sprayed at the repair layer coating on Al alloy parts surface and self-control aluminium alloy special coating when carrying out dry solidification, solidification temperature is lower 60 DEG C of baking, and the completely crued time is 1 hour.
After application varnish terminates, the position that there is open defect in aluminum alloy substrate is coated with two kinds of coatings, i.e. repair layer coating and self-control aluminium alloy special coating; The position that there is not open defect in aluminum alloy substrate is only coated with self-control aluminium alloy special coating; The coating layer thickness that there is the position of open defect in aluminum alloy substrate is 30 μm ~ 35 μm, and the coating layer thickness that there is not the position of open defect in aluminum alloy substrate is 20 μm ~ 25 μm.
Wherein, in technique scheme, the Chinese of described Tianna solution is isoamyl acetate; Described dry powder is also named " calcium-magnesium powder ", and its main component is calcium and magnesium, is typically used as filler.
Wherein, the present invention is when spraying self-control repair layer coating and self-control aluminium alloy special coating, in order to obtain the coating of high light and high-flatness, spraying coating process need adopt air-atomized mode to spray, and is applicable to the Spray painting tool such as air gun, air-assisted atomization electrostatic gun.
Compared with prior art, beneficial effect is in the present invention:
1) the present invention keeps the coating process of aluminium alloy tank car primary colors can repair scratch, scratching, the open defect such as blackening and corrosion of aluminum alloy surface, and the aluminium alloy cell body of aluminium alloy tank car and aluminium alloy part can be made again to keep the metallic luster of original uniqueness.
2) technique of Coating Pretreatment of the present invention, do not destroy the original surface color of aluminum alloy substrate and metallic luster, and those materials such as the spot affecting self-control aluminium alloy special coatings and the attachment of self-control repair layer coating and grease can be removed completely, and by manufacturing rough surface, the adhesive force of self-control aluminium alloy special coating and self-control repair layer coating is further enhanced.
3) the present invention carries out spraying covering by using self-control repair layer coating to open defect positions such as scratch, corrosion and variable colors, thus the solid colour of open defect position in aluminum alloy substrate and aluminum alloy substrate.The thickness of self-control repair layer spray painting in open defect position is 10 μm ~ 15 μm, in this thickness range, self-control repair layer coating not exclusively covers in aluminum alloy substrate just, the dim middle color that can appear aluminum alloy substrate, thus the color of the color of open defect position after self-control repair layer coating is repaired and non-mend aluminum alloy substrate is not easily distinguishable; When the thickness of self-control repair layer coating is more than 15 μm, self-control repair layer coating can cover aluminum alloy substrate completely, open defect position will present the color of self-control repair layer coating completely, thus makes the color at the color at repairing position and non-repairing position have obvious aberration.
4) the self-control repair layer coating coated by the present invention and self-control aluminium alloy special coating have excellent adhesive force and weatherability.Self-control repair layer coating and self-control aluminium alloy special coating are after subjected to the neutral salt spray test of 800 hours, and with cross-hatching (cross cut test of GB-T9286-1998 paint and varnish paint film) test, adhesive force can reach 0 grade; After 1000 hours artificial's accelerated ageings (GB-T1865-2009 sunshine degradation standard) test, the self-control repair layer coating of Al-alloy based basal surface and self-control aluminium alloy special coating do not come off, non-foaming, do not ftracture, only slight loss of gloss; Prepared aluminium alloy tank car sample after being exposed to the sun through 1.5 years in Dongguan, Guangdong area, self-control repair layer coating and the self-control aluminium alloy special coating of aluminium alloy tank car sample surfaces do not come off, non-foaming, do not ftracture and not loss of gloss; Self-control repair layer coating and self-control aluminium alloy special coating can reach more than 6 years in the service life on aluminium alloy tank car surface.
5) for the self-control aluminium alloy special coating of Al alloy parts surface coating, there is high transparent in the present invention, after being sprayed at Al alloy parts, self-control aluminium alloy special coating coating presents transparent high glaze, make the virgin metal gloss of glossiness higher than aluminum alloy substrate on whole Al alloy parts surface, under reflective effect, the recognition capability of human eye reduces, thus eliminate the aberration of the color of the color of aluminum alloy surface open defect position after self-control repair layer coating is repaired and non-mend aluminum alloy substrate, thus the color on whole Al alloy parts surface and glossiness is made to present homogeneous effect, from the appearance, whole Al alloy parts surface is just as being wrapped in one deck glass film, appearance is good.
6) the present invention keeps the coating process of aluminium alloy tank car primary colors to have the simple feature of technique.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further illustrated.
embodiment 1.
Keep a coating process for aluminium alloy tank car primary colors, it comprises the following steps:
Step one, Coating Pretreatment:
A, tear the processing diaphragm on Al alloy parts surface;
B, use Tianna solution wiping Al alloy parts surface;
C, again use dry powder wiping Al alloy parts surface;
D, manufacture rough surface: slightly polish on Al alloy parts surface with the scouring pad rotated;
E, pickling, washing: the position having black oxide with sour cream coated aluminium alloy surface of the work, then rinse whole Al alloy parts surface with clear water;
F, the whole Al alloy parts surface of use aluminium alloy special degreaser wiping; The special degreaser of aluminium alloy is mixed with the mass ratio of 1:1:1 by chlorinated polyvinyl chloride, carrene and acetone.
The reparation at step 2, aluminum alloy substrate open defect position:
A, self-control repair layer coating: in self-control aluminium alloy special coating, add aluminium powder, the metallic paint obtaining imitative aluminium sheet color after 3 minutes is stirred under normal temperature, then the color of metallic paint and the color of aluminum alloy substrate are contrasted, add inorganic mill base according to the extent of deviation of color and obtain repair layer coating, with the solid colour of the color and aluminum alloy substrate of guaranteeing repair layer coating;
B, spraying repair layer coating: position repair layer spray painting being existed in aluminum alloy substrate the open defects such as scratch, scratching, blackening and corrosion, the thickness of the repair layer coating of required spraying is 10 μm;
Step 3, application varnish:
A, by whole Al alloy parts surface spraying self-control aluminium alloy special coating;
B, dry solidification is carried out to the repair layer coating and self-control aluminium alloy special coating that are sprayed at Al alloy parts surface;
After application varnish terminates, the position that there is open defect in aluminum alloy substrate is coated with two kinds of coatings, i.e. repair layer coating and self-control aluminium alloy special coating; The position that there is not open defect in aluminum alloy substrate is only coated with self-control aluminium alloy special coating; The coating layer thickness that there is the position of open defect in aluminum alloy substrate is 30 μm, and the coating layer thickness that there is not the position of open defect in aluminum alloy substrate is 20 μm.
Wherein, make aluminium alloy special coating by oneself to be made up of organic-silicon-modified resin, adhesion promoter, levelling agent and defoamer; The quality of adhesion promoter, levelling agent and defoamer accounts for 0.1%, 0.3% and 0.2% of the quality of organic-silicon-modified resin respectively;
Wherein, organic-silicon-modified resin is organosilicon modified crylic acid resin, and organosilicon modified crylic acid resin can painting (Qingdao) Co., Ltd be provided by resistance to painting, and the trade mark of organosilicon modified crylic acid resin is diamond finish paint No.100;
Adhesion promoter is 3-(2,3-epoxy third oxygen) propyl trimethoxy silicane; Levelling agent and defoamer provide for Dongguan City starlight industrial chemicals Co., Ltd, and the trade mark of levelling agent is BYK-310, and the trade mark of defoamer is BYK-A560;
In the present embodiment, in step 2 and step 3, the curing agent added before spraying repair layer coating and self-control aluminium alloy special coating is polyamide, and polyamide is 1:3 with the mass ratio of self-control aluminium alloy special coating.Wherein, be sprayed at the repair layer coating on Al alloy parts surface and self-control aluminium alloy special coating when carrying out dry solidification, solidification temperature is lower 25 DEG C of room temperature, and the completely crued time is 24 hours.
Sour cream in the step e of step one Coating Pretreatment is made up of the raw material of following weight portion:
42 parts, nitric acid (mass percentage concentration 67%)
6 parts, hydrofluoric acid (mass percentage concentration 47%)
Phosphoric acid (mass percentage concentration 85%) 26 parts
Bentonite 140 parts
Sodium phosphate 10 parts
100 parts, water.
Wherein, bentonitic particle size is 100 orders.
The quality of aluminium powder accounts for 10% of the quality of repair layer coating, and the particle size of aluminium powder is 250 orders; The quality of inorganic mill base accounts for 0.5% of the quality of repair layer coating, and this color composition implementing inorganic mill base used is carbon black and iron oxide red.
In the present embodiment, due to the film forming matter of organosilicon modified crylic acid resin as self-control aluminium alloy special coating that the employing trade mark is diamond finish paint No.100, the self-control repair layer coating coated by the present invention and self-control aluminium alloy special coating is made to have excellent adhesive force and weatherability.Self-control repair layer coating and self-control aluminium alloy special coating are after subjected to the neutral salt spray test of 800 hours, and with cross-hatching (cross cut test of GB-T9286-1998 paint and varnish paint film) test, adhesive force reaches 0 grade; After 1000 hours artificial's accelerated ageings (GB-T1865-2009 sunshine degradation standard) test, the self-control repair layer coating of Al-alloy based basal surface and self-control aluminium alloy special coating do not come off, non-foaming, do not ftracture, not loss of gloss; Prepared aluminium alloy tank car sample after being exposed to the sun through 1.5 years in Dongguan, Guangdong area, self-control repair layer coating and the self-control aluminium alloy special coating of aluminium alloy tank car sample surfaces do not come off, non-foaming, do not ftracture and not loss of gloss; Self-control repair layer coating and self-control aluminium alloy special coating can reach more than 6 years in the service life on aluminium alloy tank car surface.
embodiment 2.
Keep a coating process for aluminium alloy tank car primary colors, it comprises the following steps:
Step one, Coating Pretreatment:
A, tear the processing diaphragm on Al alloy parts surface;
B, use Tianna solution wiping Al alloy parts surface;
C, again use dry powder wiping Al alloy parts surface;
D, manufacture rough surface: slightly polish on Al alloy parts surface with the scouring pad rotated;
E, pickling, washing: the position having black oxide with sour cream coated aluminium alloy surface of the work, then rinse whole Al alloy parts surface with clear water;
F, the whole Al alloy parts surface of use aluminium alloy special degreaser wiping; The special degreaser of aluminium alloy is mixed with the mass ratio of 1:1:1 by chlorinated polyvinyl chloride, carrene and acetone.
The reparation at step 2, aluminum alloy substrate open defect position:
A, self-control repair layer coating: in self-control aluminium alloy special coating, add aluminium powder, the metallic paint obtaining imitative aluminium sheet color after 5 minutes is stirred under normal temperature, then the color of metallic paint and the color of aluminum alloy substrate are contrasted, add inorganic mill base according to the extent of deviation of color and obtain repair layer coating, with the solid colour of the color and aluminum alloy substrate of guaranteeing repair layer coating;
B, spraying repair layer coating: position repair layer spray painting being existed in aluminum alloy substrate the open defects such as scratch, scratching, blackening and corrosion, the thickness of the repair layer coating of required spraying is 15 μm;
Step 3, application varnish:
A, by whole Al alloy parts surface spraying self-control aluminium alloy special coating;
B, dry solidification is carried out to the repair layer coating and self-control aluminium alloy special coating that are sprayed at Al alloy parts surface;
After application varnish terminates, the position that there is open defect in aluminum alloy substrate is coated with two kinds of coatings, i.e. repair layer coating and self-control aluminium alloy special coating; The position that there is not open defect in aluminum alloy substrate is only coated with self-control aluminium alloy special coating; The coating layer thickness that there is the position of open defect in aluminum alloy substrate is 35 μm, and the coating layer thickness that there is not the position of open defect in aluminum alloy substrate is 25 μm.
Wherein, make aluminium alloy special coating by oneself to be made up of organic-silicon-modified resin, adhesion promoter, levelling agent and defoamer; The quality of adhesion promoter, levelling agent and defoamer accounts for 0.5%, 0.1% and 0.3% of the quality of organic-silicon-modified resin respectively;
Wherein, organic-silicon-modified resin is organic silicon modified polyurethane resin, and organic silicon modified polyurethane resin is provided by COSCO Kansai Paint & Chemicals (Zhuhai) Co. Ltd., and the trade mark of organic silicon modified polyurethane resin is aluminium polyurethane lacquer;
Adhesion promoter is 3-(2,3-epoxy third oxygen) propyl trimethoxy silicane; Levelling agent and defoamer provide for Dongguan City starlight industrial chemicals Co., Ltd, and the trade mark of levelling agent is BYK-310, and the trade mark of defoamer is BYK-A560;
In the present embodiment, in step 2 and step 3, the curing agent added before spraying repair layer coating and self-control aluminium alloy special coating is polyamide, and polyamide is 1:5 with the mass ratio of self-control aluminium alloy special coating.Wherein, be sprayed at the repair layer coating on Al alloy parts surface and self-control aluminium alloy special coating when carrying out dry solidification, solidification temperature is lower 60 DEG C of baking, and the completely crued time is 1 hour.
Sour cream in the step e of step one Coating Pretreatment is made up of the raw material of following weight portion:
35 parts, nitric acid (mass percentage concentration 67%)
7 parts, hydrofluoric acid (mass percentage concentration 47%)
Phosphoric acid (mass percentage concentration 85%) 22 parts
Bentonite 150 parts
Sodium phosphate 13 parts
90 parts, water.
Wherein, bentonitic particle size is 200 orders.
The quality of aluminium powder accounts for 8% of the quality of repair layer coating, and the particle size of aluminium powder is 300 orders; The quality of inorganic mill base accounts for 3% of the quality of repair layer coating, and this color composition implementing inorganic mill base used is rutile type titanium white and iron oxide red.
In the present embodiment, due to the film forming matter of organic silicon modified polyurethane resin as self-control aluminium alloy special coating that the employing trade mark is aluminium polyurethane lacquer, the self-control repair layer coating coated by the present invention and self-control aluminium alloy special coating is made to have excellent adhesive force and weatherability.Self-control repair layer coating and self-control aluminium alloy special coating are after subjected to the neutral salt spray test of 800 hours, and with cross-hatching (cross cut test of GB-T9286-1998 paint and varnish paint film) test, adhesive force reaches 1 grade; After 1000 hours artificial's accelerated ageings (GB-T1865-2009 sunshine degradation standard) test, the self-control repair layer coating of Al-alloy based basal surface and self-control aluminium alloy special coating do not come off, non-foaming, do not ftracture, only slight loss of gloss; Prepared aluminium alloy tank car sample after being exposed to the sun through 1.5 years in Dongguan, Guangdong area, self-control repair layer coating and the self-control aluminium alloy special coating of aluminium alloy tank car sample surfaces do not come off, non-foaming, do not ftracture and not loss of gloss; Self-control repair layer coating and self-control aluminium alloy special coating can reach more than 6 years in the service life on aluminium alloy tank car surface.
embodiment 3.
Keep a coating process for aluminium alloy tank car primary colors, it comprises the following steps:
Step one, Coating Pretreatment:
A, tear the processing diaphragm on Al alloy parts surface;
B, use Tianna solution wiping Al alloy parts surface;
C, again use dry powder wiping Al alloy parts surface;
D, manufacture rough surface: slightly polish on Al alloy parts surface with the scouring pad rotated;
E, pickling, washing: the position having black oxide with sour cream coated aluminium alloy surface of the work, then rinse whole Al alloy parts surface with clear water;
F, the whole Al alloy parts surface of use aluminium alloy special degreaser wiping; The special degreaser of aluminium alloy is mixed with the mass ratio of 1:1:1 by chlorinated polyvinyl chloride, carrene and acetone.
The reparation at step 2, aluminum alloy substrate open defect position:
A, self-control repair layer coating: in self-control aluminium alloy special coating, add aluminium powder, the metallic paint obtaining imitative aluminium sheet color after 4 minutes is stirred under normal temperature, then the color of metallic paint and the color of aluminum alloy substrate are contrasted, add inorganic mill base according to the extent of deviation of color and obtain repair layer coating, with the solid colour of the color and aluminum alloy substrate of guaranteeing repair layer coating;
B, spraying repair layer coating: position repair layer spray painting being existed in aluminum alloy substrate the open defects such as scratch, scratching, blackening and corrosion, the thickness of the repair layer coating of required spraying is 12 μm;
Step 3, application varnish:
A, by whole Al alloy parts surface spraying self-control aluminium alloy special coating;
B, dry solidification is carried out to the repair layer coating and self-control aluminium alloy special coating that are sprayed at Al alloy parts surface;
After application varnish terminates, the position that there is open defect in aluminum alloy substrate is coated with two kinds of coatings, i.e. repair layer coating and self-control aluminium alloy special coating; The position that there is not open defect in aluminum alloy substrate is only coated with self-control aluminium alloy special coating; The coating layer thickness that there is the position of open defect in aluminum alloy substrate is 33 μm, and the coating layer thickness that there is not the position of open defect in aluminum alloy substrate is 22 μm.
Wherein, make aluminium alloy special coating by oneself to be made up of organic-silicon-modified resin, adhesion promoter, levelling agent and defoamer; The quality of adhesion promoter, levelling agent and defoamer accounts for 0.3%, 0.5% and 0.1% of the quality of organic-silicon-modified resin respectively;
Wherein, organic-silicon-modified resin is organic silicon modified polyurethane resin, and organic silicon modified polyurethane resin is provided by COSCO Kansai Paint & Chemicals (Zhuhai) Co. Ltd., and the trade mark of organic silicon modified polyurethane resin is polyurethane 6000 varnish;
Adhesion promoter is 3-(2,3-epoxy third oxygen) propyl trimethoxy silicane; Levelling agent and defoamer provide for Dongguan City starlight industrial chemicals Co., Ltd, and the trade mark of levelling agent is BYK-310, and the trade mark of defoamer is BYK-A560;
In the present embodiment, in step 2 and step 3, the curing agent added before spraying repair layer coating and self-control aluminium alloy special coating is polyamide, and polyamide is 1:5 with the mass ratio of self-control aluminium alloy special coating.Wherein, be sprayed at the repair layer coating on Al alloy parts surface and self-control aluminium alloy special coating when carrying out dry solidification, solidification temperature is lower 60 DEG C of baking, and the completely crued time is 1 hour.
Sour cream in the step e of step one Coating Pretreatment is made up of the raw material of following weight portion:
45 parts, nitric acid (mass percentage concentration 67%)
4 parts, hydrofluoric acid (mass percentage concentration 47%)
Phosphoric acid (mass percentage concentration 85%) 28 parts
Bentonite 130 parts
Sodium phosphate 8 parts
110 parts, water.
Wherein, bentonitic particle size is 150 orders.
The quality of aluminium powder accounts for 12% of the quality of repair layer coating, and the particle size of aluminium powder is 200 orders; The quality of inorganic mill base accounts for 1% of the quality of repair layer coating, and this color composition implementing inorganic mill base used is carbon black and iron oxide red.
In the present embodiment, due to the film forming matter of organic silicon modified polyurethane resin as self-control aluminium alloy special coating that the employing trade mark is polyurethane 6000 varnish, the self-control repair layer coating coated by the present invention and self-control aluminium alloy special coating is made to have excellent adhesive force and weatherability.Self-control repair layer coating and self-control aluminium alloy special coating are after subjected to the neutral salt spray test of 800 hours, and with cross-hatching (cross cut test of GB-T9286-1998 paint and varnish paint film) test, adhesive force reaches 1 grade; After 1000 hours artificial's accelerated ageings (GB-T1865-2009 sunshine degradation standard) test, the self-control repair layer coating of Al-alloy based basal surface and self-control aluminium alloy special coating do not come off, non-foaming, do not ftracture, only slight loss of gloss; Prepared aluminium alloy tank car sample after being exposed to the sun through 1.5 years in Dongguan, Guangdong area, self-control repair layer coating and the self-control aluminium alloy special coating of aluminium alloy tank car sample surfaces do not come off, non-foaming, do not ftracture and not loss of gloss; Self-control repair layer coating and self-control aluminium alloy special coating can reach more than 6 years in the service life on aluminium alloy tank car surface.
embodiment 4.
Keep a coating process for aluminium alloy tank car primary colors, it comprises the following steps:
Step one, Coating Pretreatment:
A, tear the processing diaphragm on Al alloy parts surface;
B, use Tianna solution wiping Al alloy parts surface;
C, again use dry powder wiping Al alloy parts surface;
D, manufacture rough surface: slightly polish on Al alloy parts surface with the scouring pad rotated;
E, pickling, washing: the position having black oxide with sour cream coated aluminium alloy surface of the work, then rinse whole Al alloy parts surface with clear water;
F, the whole Al alloy parts surface of use aluminium alloy special degreaser wiping; The special degreaser of aluminium alloy is mixed with the mass ratio of 1:1:1 by chlorinated polyvinyl chloride, carrene and acetone.
The reparation at step 2, aluminum alloy substrate open defect position:
A, self-control repair layer coating: in self-control aluminium alloy special coating, add aluminium powder, the metallic paint obtaining imitative aluminium sheet color after 3 minutes is stirred under normal temperature, then the color of metallic paint and the color of aluminum alloy substrate are contrasted, add inorganic mill base according to the extent of deviation of color and obtain repair layer coating, with the solid colour of the color and aluminum alloy substrate of guaranteeing repair layer coating;
B, spraying repair layer coating: position repair layer spray painting being existed in aluminum alloy substrate the open defects such as scratch, scratching, blackening and corrosion, the thickness of the repair layer coating of required spraying is 13 μm;
Step 3, application varnish:
A, by whole Al alloy parts surface spraying self-control aluminium alloy special coating;
B, dry solidification is carried out to the repair layer coating and self-control aluminium alloy special coating that are sprayed at Al alloy parts surface;
After application varnish terminates, the position that there is open defect in aluminum alloy substrate is coated with two kinds of coatings, i.e. repair layer coating and self-control aluminium alloy special coating; The position that there is not open defect in aluminum alloy substrate is only coated with self-control aluminium alloy special coating; The coating layer thickness that there is the position of open defect in aluminum alloy substrate is 31 μm, and the coating layer thickness that there is not the position of open defect in aluminum alloy substrate is 23 μm.
Wherein, make aluminium alloy special coating by oneself to be made up of organic-silicon-modified resin, adhesion promoter, levelling agent and defoamer; The quality of adhesion promoter, levelling agent and defoamer accounts for 0.2%, 0.3% and 0.5% of the quality of organic-silicon-modified resin respectively;
Wherein organic-silicon-modified resin is organosilicon modified crylic acid resin, and organosilicon modified crylic acid resin can painting (Qingdao) Co., Ltd be provided by resistance to painting, and the trade mark of organosilicon modified crylic acid resin is diamond finish paint No.100;
Adhesion promoter is 3-(2,3-epoxy third oxygen) propyl trimethoxy silicane; Levelling agent and defoamer provide for Dongguan City starlight industrial chemicals Co., Ltd, and the trade mark of levelling agent is BYK-310, and the trade mark of defoamer is BYK-A560;
In the present embodiment, in step 2 and step 3, the curing agent added before spraying repair layer coating and self-control aluminium alloy special coating is polyamide, and polyamide is 1:3 with the mass ratio of self-control aluminium alloy special coating.Wherein, be sprayed at the repair layer coating on Al alloy parts surface and self-control aluminium alloy special coating when carrying out dry solidification, solidification temperature is lower 25 DEG C of room temperature, and the completely crued time is 24 hours.
Sour cream in the step e of step one Coating Pretreatment is made up of the raw material of following weight portion:
43 parts, nitric acid (mass percentage concentration 67%)
5 parts, hydrofluoric acid (mass percentage concentration 47%)
Phosphoric acid (mass percentage concentration 85%) 25 parts
Bentonite 145 parts
Sodium phosphate 9 parts
95 parts, water.
Wherein, bentonitic particle size is 100 orders.
The quality of aluminium powder accounts for 9% of the quality of repair layer coating, and the particle size of aluminium powder is 400 orders; The quality of inorganic mill base accounts for 2% of the quality of repair layer coating, and this color composition implementing inorganic mill base used is phthalocyanine blue and carbon black.
In the present embodiment, due to the film forming matter of organosilicon modified crylic acid resin as self-control aluminium alloy special coating that the employing trade mark is diamond finish paint No.100, the self-control repair layer coating coated by the present invention and self-control aluminium alloy special coating is made to have excellent adhesive force and weatherability.Self-control repair layer coating and self-control aluminium alloy special coating are after subjected to the neutral salt spray test of 800 hours, and with cross-hatching (cross cut test of GB-T9286-1998 paint and varnish paint film) test, adhesive force reaches 0 grade; After 1000 hours artificial's accelerated ageings (GB-T1865-2009 sunshine degradation standard) test, the self-control repair layer coating of Al-alloy based basal surface and self-control aluminium alloy special coating do not come off, non-foaming, do not ftracture, not loss of gloss; Prepared aluminium alloy tank car sample after being exposed to the sun through 1.5 years in Dongguan, Guangdong area, self-control repair layer coating and the self-control aluminium alloy special coating of aluminium alloy tank car sample surfaces do not come off, non-foaming, do not ftracture and not loss of gloss; Self-control repair layer coating and self-control aluminium alloy special coating can reach more than 6 years in the service life on aluminium alloy tank car surface.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although done to explain to the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (8)
1. keep a coating process for aluminium alloy tank car primary colors, it is characterized in that, it comprises the following steps:
Step one, Coating Pretreatment:
A, tear the processing diaphragm on Al alloy parts surface;
B, use Tianna solution wiping Al alloy parts surface;
C, again use dry powder wiping Al alloy parts surface;
D, manufacture rough surface: slightly polish on Al alloy parts surface with the scouring pad rotated;
E, pickling, washing: the position having black oxide with sour cream coated aluminium alloy surface of the work, then rinse whole Al alloy parts surface with clear water;
F, the whole Al alloy parts surface of use aluminium alloy special degreaser wiping;
The reparation at step 2, aluminum alloy substrate open defect position:
A, self-control repair layer coating: in self-control aluminium alloy special coating, add aluminium powder, the metallic paint of imitative aluminium sheet color is obtained after stirring under normal temperature, then the color of described metallic paint and the color of aluminum alloy substrate are contrasted, add inorganic mill base according to the extent of deviation of color and obtain repair layer coating, with the solid colour of the color and aluminum alloy substrate of guaranteeing repair layer coating;
B, spraying repair layer coating: position repair layer spray painting being existed in aluminum alloy substrate open defect, the thickness of the repair layer coating of required spraying is 10 μm ~ 15 μm;
Step 3, application varnish:
A, by whole Al alloy parts surface spraying self-control aluminium alloy special coating;
B, dry solidification is carried out to the repair layer coating and self-control aluminium alloy special coating that are sprayed at Al alloy parts surface;
Wherein, described self-control aluminium alloy special coating is made up of organic-silicon-modified resin, adhesion promoter, levelling agent and defoamer; The quality of described adhesion promoter, described levelling agent and described defoamer accounts for 0.1% ~ 0.5% of the quality of described organic-silicon-modified resin respectively;
Wherein, described organic-silicon-modified resin is organosilicon modified crylic acid resin or organic silicon modified polyurethane resin;
Sour cream in step e in described step one Coating Pretreatment is made up of the raw material of following weight portion:
35 parts ~ 45 parts, the nitric acid of mass percentage concentration 67%
4 parts ~ 7 parts, the hydrofluoric acid of mass percentage concentration 47%
The phosphoric acid of mass percentage concentration 85% 22 parts ~ 28 parts
Bentonite 130 parts ~ 150 parts
Sodium phosphate 8 parts ~ 13 parts
90 parts ~ 110 parts, water;
Wherein, described bentonitic particle size is 100 order ~ 200 orders;
The special degreaser of described aluminium alloy is mixed with the mass ratio of 1:1:1 by chlorinated polyvinyl chloride, carrene and acetone.
2. a kind of coating process keeping aluminium alloy tank car primary colors according to claim 1, is characterized in that: described sour cream is made up of the raw material of following weight portion:
42 parts, the nitric acid of mass percentage concentration 67%
6 parts, the hydrofluoric acid of mass percentage concentration 47%
The phosphoric acid of mass percentage concentration 85% 26 parts
Bentonite 140 parts
Sodium phosphate 10 parts
100 parts, water.
3. a kind of coating process keeping aluminium alloy tank car primary colors according to claim 1, it is characterized in that: the quality of described aluminium powder accounts for 8% ~ 12% of the quality of described repair layer coating, the quality of described inorganic mill base accounts for 0.5% ~ 3% of the quality of described repair layer coating.
4. a kind of coating process keeping aluminium alloy tank car primary colors according to claim 3, is characterized in that: the particle size of described aluminium powder is 200 order ~ 400 orders.
5. a kind of coating process keeping aluminium alloy tank car primary colors according to claim 1, it is characterized in that: in step 2 and step 3, before spraying repair layer coating and self-control aluminium alloy special coating, need add curing agent polyamide, polyamide is 1:3 or 1:5 with the mass ratio of self-control aluminium alloy special coating.
6. a kind of coating process keeping aluminium alloy tank car primary colors according to claim 5, it is characterized in that: be sprayed at the repair layer coating on Al alloy parts surface and self-control aluminium alloy special coating when carrying out dry solidification, solidification temperature is lower 25 DEG C of room temperature, and the completely crued time is 24 hours.
7. a kind of coating process keeping aluminium alloy tank car primary colors according to claim 6, it is characterized in that: be sprayed at the repair layer coating on Al alloy parts surface and self-control aluminium alloy special coating when carrying out dry solidification, solidification temperature is lower 60 DEG C of baking, and the completely crued time is 1 hour.
8. a kind of coating process keeping aluminium alloy tank car primary colors according to claim 1, it is characterized in that: after application varnish terminates, the position that there is open defect in aluminum alloy substrate is coated with two kinds of coatings, i.e. repair layer coating and self-control aluminium alloy special coating; The position that there is not open defect in aluminum alloy substrate is only coated with self-control aluminium alloy special coating; The coating layer thickness that there is the position of open defect in aluminum alloy substrate is 30 μm ~ 35 μm, and the coating layer thickness that there is not the position of open defect in aluminum alloy substrate is 20 μm ~ 25 μm.
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| CN113731773A (en) * | 2021-09-27 | 2021-12-03 | 贵州航天南海科技有限责任公司 | Remediation method for color difference of local sulfuric acid anodic oxidation |
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| US6422449B1 (en) * | 1999-05-26 | 2002-07-23 | Hitachi, Ltd. | Method of mending a friction stir welding portion |
| CN1301879A (en) * | 1999-12-28 | 2001-07-04 | 中国科学院力学研究所 | Method for thermal dip plating with rear earth aluminium alloy |
| CN101094937A (en) * | 2004-11-10 | 2007-12-26 | 凯密特尔股份有限公司 | Process for producing a repair coating on a coated metallic surface |
| CN101538729A (en) * | 2009-03-17 | 2009-09-23 | 西北工业大学 | Method for quickly restoring partial oxidation film of aluminum alloy surface |
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