How to carry out phosphating treatment on the surface of suction countersunk rivet? This one has a certain processing flow and technology. It's the beginning of the class in Xikun primary school. Now let's have a look with zhekun editor.

In principle, the phosphating treatment on the surface of the suction countersunk rivet should belong to the chemical conversion coating treatment, which is mainly used for phosphating the surface of the suction countersunk rivet. The phosphating treatment can also be used for non-ferrous metal (such as aluminum, iron, zinc) parts. The modern phosphating process of suction countersunk nail is: degreasing → washing → derusting → surface adjusting → phosphating → washing → drying.

I. phosphating treatment of hollow countersunk rivet

The so-called phosphating treatment is a surface chemical treatment method that the metal surface contacts with the acid solution containing dihydrogen phosphate and generates a stable insoluble inorganic compound film on the metal surface. The film formed is called phosphating film.

II. Rust removal and deoxidization before the application of suction countersunk rivet

Hard and brittle oxide scale is produced during hot working of iron and steel, such as hot-rolled steel plate, heat-treated parts, forgings and weldments. In addition, steel in the process of storage and transportation, contact with water or other corrosive media, are prone to a layer of yellow rust. The oxide scale and yellow rust under the coating will increase the corrosion rate of steel. It can be seen that it is very important to fully remove the oxide skin and yellow rust on the steel surface for the protection of the coating materials. There are two kinds of derusting methods, one is mechanical method, the other is chemical method.

III. degreasing of suction countersunk rivet

Steel and its parts shall be protected by rust proof grease during storage and transportation. Generally, drawing oil shall be used for alloy processing under pressure, emulsion shall be contacted for forest parts during cutting, cooling oil may be contacted during heat treatment, oil and sweat traces on the operator's hands are often found on parts, and grease on parts is always mixed with dust and other impurities. The grease on the parts not only hinders the formation of the phosphating film, but also affects the adhesion, drying performance, decoration performance and corrosion resistance of the coating after phosphating.

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