Car trunk hinge part and production process thereof

Abstract

The invention discloses a car trunk hinge part. The outer surface of the hinge part is treated with a phosphating solution to form a phosphating film, wherein the phosphating solution comprises the following components in parts by weight: 30-40 parts of phosphoric acid, 0.1-0.5 part of copper nitrate, 15-20 parts of zinc oxide, 1-3 parts of manganese salt, 2-4 parts of nickel nitrate, and 7-10 parts of a compound accelerant. The car trunk hinge part has the advantages that: phosphoric acid and zinc oxide are taken as main film-forming substances, so that a continuous and uniform phosphating film is formed on a treated metal surface. Meanwhile, the compound accelerant further can be added to increase film-forming speed of the phosphating film and improve film-forming quality of the phosphating film. Besides, electrode potential of copper is positive than that of iron, and copper ions are reduced for being deposited on the surface of a phosphated hinge body, so that a cathode region of the surface is increased, electrochemical reaction of phosphating is further promoted, formation of a phosphating crystal nucleus is accelerated, and crystalline grains are refined, and therefore, thephosphating film is compact and uniform, phosphating speed is reduced, and the phosphating film has the advantages of being tight in film-forming and strong in adhesive force.

Description

technical field [0001] The invention relates to the field of auto parts, more specifically, it relates to a hinge part of an auto trunk and a production process thereof. Background technique [0002] The opening and closing of the trunk of a car is usually inseparable from the setting of the hinge, and the hinge is usually a bow-shaped metal iron piece. [0003] The service life of a car is usually about 10-15 years, which makes the oxidation resistance and corrosion resistance of the trunk hinge extremely important. However, in the prior art, only chemical phosphating treatment is usually used for the trunk hinge to improve the anti-oxidation and anti-corrosion effects of the metal surface. [0004] However, because the hinge is an accessory that is not often replaced in the automobile, during long-term use, the existing phosphating film is relatively loose, prone to falling off and failing, and needs to be improved. Contents of the invention [0005] In view of the def...

AI Technical Summary

Problems solved by technology

However, in the prior art, the hinges of the trunk usually only adopt chemical phosphating treatment to improve the anti-oxidation and anti-corrosion effects of the metal surface.

[0004] However, since the hinge is an accessory that is not often replaced in the car, during long-term use, the existing phosphating film is relatively loose, and it is prone to fall off and fail, so it needs to be improved.

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