Mechanical zinc-plating process

Abstract

The present invention provides a mechanical galvanization process. It uses industrial zine powder (150-300 meshes) as raw material, utilizes special-purpose active dispersion galvanization adjuvant and uses glass microbeads as impact medium to implement mechanical galvanization of iron base metal workpieces of metal structure components, standard components and casting iron pipe, etc. and can obttain the uniform, compact and smooth pure galvanized layer with silver white colour. Said galvanized layer possesses good corrosion resistance and stability.

Description

1 Technical field [0001] The invention belongs to the technical field of surface coating, in particular to a mechanical galvanizing process. 2 background technology [0002] Mechanical galvanizing is a new surface coating process developed in the 1970s. It has the advantages of room temperature operation, no hydrogen embrittlement, fast plating speed, high production efficiency, low cost, and little pollution. Therefore, It is widely used in the industrial field. The existing mechanical galvanizing process is: pretreatment (degreasing → rinsing → pickling → rinsing) → flash plating → galvanizing → separation → rinsing → drying and other processes. [0003] The "flash plating" operation is to form a layer of other metal layers that are more flexible than zinc on the surface of iron-based metal parts before galvanizing. The purpose of this step is twofold: one is to prevent the oxidation of the iron base; the other is to utilize the sensitization reaction between the formed ...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent with the patent number CN1052512A adopts electric furnace zinc powder for mechanical galvanizing, first forms a copper layer on the iron base, and then coats it with an activator (mainly polyvinyl alcohol, sodium lauryl sulfate, sodium bicarbonate, butene, etc.) Under the joint action of dibutyl diacid, dibutyl phthalate, etc.) and metal salts (stannous chloride, tin oxide, etc.), a mechanical galvanized layer composed of copper, tin and zinc is obtained, Coating has limited corrosion resistance