Aqueous chromium-free surface treatment solution for combining color coating pretreatment and base paint coating of galvanized plate
A surface treatment liquid, pretreatment technology, applied in the direction of metal material coating process, etc., to achieve excellent corrosion resistance and adhesion, improve corrosion resistance, simplify the effect of color coating treatment process
Inactive Publication Date: 2011-07-13
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
The passivation effect of these passivation solutions is greatly improved compared with single passivation, but compared with chromate passivation, the overall performance of the film still needs to be improved
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[0030] The surface of the galvanized sheet is chemically degreased with a degreasing solution, rinsed with tap water, rinsed with deionized water, and dried with hot air before pretreatment.
[0031] Pretreatment liquid temperature: room temperature, passivation time: 15s, passivation method: dip coating, spray coating, roller coating are all available, drying temperature: 80-100 ℃ drying.
[0032] The compositions of the surface treatment liquids used in the examples and comparative examples of the present invention are shown in Table 1.
[0033] Table 1 surface treatment liquid composition
[0034]
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The invention provides aqueous chromium-free surface treatment solution for combining color coating pretreatment and base paint coating of a galvanized plate, and belongs to the technical field of surface treatment of galvanized plates. The treatment solution comprises the following components in percentage by mass: 20 to 60 percent of waterborne resin, 0.5 to 1.5 percent of organic silane, 0.25 to 0.8 percent of inorganic corrosion inhibitor, 0.1 to 0.3 percent of sealing agent, 0.02 to 0.05 percent of stabilizing agent, and the balance of deionized water serving as a solvent. By using the surface treatment solution provided by the invention, a compact passivation film can be formed on the surface of the galvanized plate, and the total performance of the passivation film can reach or exceed the level of a chromate passivation film; because of excellent corrosion resistance and adhesive force of the surface treatment solution, a finishing paint can be directly coated on the coated paint film layer serving as the base paint of the color coated plate, so the color coating treatment process for the galvanized plate is simplified, and the reduction of the cost is favorable; and the montmorillonite with lamellar structure in the paint film is favorable for blocking oxygen and water vapor from contacting a substrate so as to effectively improve the corrosion resistance.
Description
Technical field: [0001] The invention relates to the technical field of surface treatment of galvanized sheets, in particular to a water-based chrome-free surface treatment liquid which combines color coating pretreatment and primer coating of galvanized sheets. Background technique: [0002] Color-coated steel plate refers to a pre-coated metallurgical product made of protective and decorative organic paint or film continuously coated on the surface of the steel plate. This kind of steel plate combines the properties of organic polymers and metals, and has good corrosion resistance and processing properties. The manifestation of the corrosion resistance of color-coated plates is usually expressed by the degree of corrosion damage such as loss of gloss, discoloration, pulverization, fine cracks, cracks, bubbling and rust spots on the surface of the coating. Galvanized sheet is a common substrate for color-coated sheets, which must be pretreated before painting to improve co...
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IPC IPC(8): C23C22/42
Inventor 张千峰陈均胡丰徐丽萍叶鹏飞
Owner ANHUI UNIVERSITY OF TECHNOLOGY