Physical pretreatment and electrophoresis coating process of aluminum magnesium alloy

Abstract

The invention provides a physical pretreatment and electrophoresis coating process of an aluminum magnesium alloy, which is divided into two items of physical pretreatment and electrophoresis coating, wherein the physical pretreatment is surface abrasive blasting; and in the surface abrasive blasting process, the size of abrasive grains is determined according to the roughness required by the surface of a workpiece. The invention also discloses the process steps of the physical pretreatment and the electrophoresis coating of the aluminum magnesium alloy, which comprise abrasive selecting, spray gun adjusting, abrasive blasting, dedusting, electrophoresis coating, cleaning and drying, ceramic coating spraying and drying. The physical pretreatment and electrophoresis coating process of the aluminum magnesium alloy adopts the treatment process combining the abrasive blasting treatment and the electrophoresis coating, not only reduces the environment pollution and the damages to the human body, but also has the advantages of simple process operation, low cost, environment protection, no toxin, good surface cleanness, tight and firm combination of the coating obtained by an electrophoresis coating and a substrate of the workpiece, good adhesion, compact and attractive surface coating of the aluminum magnesium alloy, and obvious corrosion resistance enhancement.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to an aluminum-magnesium alloy surface treatment technology, in particular to an aluminum-magnesium alloy physical pretreatment and electrophoretic coating process. Background technique [0002] At present, the pretreatment process of aluminum-magnesium alloy basically adopts phosphating treatment and passivation treatment. The use of this kind of pretreatment process has certain pollution and harm to the natural environment and human health, and there are high cost of process implementation and operation Relatively complex and other disadvantages; the phosphating process or passivation process used in the pre-treatment technology of aluminum-magnesium alloy electrophoretic coating, in which the phosphating process contains inorganic phosphorus that is difficult to neutralize, which is responsible for the phosphorus-rich pollution of the water system One, and phosphati...

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Problems solved by technology

[0002] At present, the pretreatment process of aluminum-magnesium alloy basically adopts phosphating treatment and passivation treatment. The use of this kind of pretreatment process has certain pollution and harm to the natural environment and human health, and there are high cost of process implementation and operation Relatively complex and other disadvantages; the phosphating process or passivation process used in the pre-treatment technology of aluminum-magnesium alloy electrophoretic coating, in which the phosphating process contains inorganic phosphorus that is difficult to neutralize, which is responsible for the phosphorus-rich pollution of the water system One, and phosphating is a medium-strong acid, which has strong corrosion hazards to the equipment. The biggest disadvantage of the aluminum-magnesium alloy phosphate treatment process is that the solution is consumed quickly, and the composition and acidity of the solution must be continuously corrected; the passivation process is mainly It is a chromate solution containing hexavalent chromium or trivalent chromium. Although it performs better in corrosion resistance and adhesion, but because chromate solution has great harm to the human body and the environment, it has gradually become popular in recent years. Chromium-free treatment process development

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