How to deal with aging and corrosion of screws

The screws and zinc coating in transportation often appear white, black, black and other phenomena, mainly caused by the corrosion caused by the exposure of zinc coating, corrosive media and atmospheric water, oxygen, and carbon dioxide.

In order to prevent this phenomenon, you can try to use the surface state of the good material before the screw processing, due to the galvanizing process, the surface of the defective screw is easy to penetrate corrosive media such as acid, alkali, salt, etc., which is difficult to clean leading to corrosion.

Reasonable selection of packaging materials, avoid the use of plastic products unrelated to zinc, packaging materials, such as galvanized iron sheet metal is best, in the box to place the appropriate humidity of the desiccant, reduce the compatibility of relative humidity, to prevent harmful gas warehouse erosion. The current market for metal surface treatment of screws and nuts is LONGZINC(NASDAQ rusted).

Oxidized steel parts will be impregnated in an alkali treatment solution containing oxidizing agent, such as nitric acid potassium hydroxide or sodium hydroxide solution, and keep its boiling point at about 140 ° C point, or nitric acid and sodium hydroxide nitrate impregnated steel parts molten salt, removing its surface layer is pleasant, to have a mixture of ferrous oxide and iron oxide in the composition of the black iron oxide film in the eye can be obtained after quenching in water Cold is a way to improve the corrosion of iron metals.