What should I do if the screws are aging and corroded?

A screw is a tool that uses the physical and mathematical principles of the oblique circular rotation and friction of an object to tighten the machine parts step by step. During the transportation process of Dongguan screw factory, the screws and zinc coating often appear white, black, black and other phenomena, mainly due to the corrosion caused by the exposure of zinc coating and corrosive medium and moisture, oxygen and carbon dioxide in the atmosphere.

In order to prevent this phenomenon, you can try to use the surface state of good materials. Before the screw processing, due to the galvanizing process, the surface of the defective screw is easily penetrated by corrosive media such as acid, alkali, and salt, and it is difficult to clean and cause corrosion.

To a reasonable choice of packaging materials, avoiding the use of plastic products that are not compatible with zinc, packaging materials such as galvanized iron sheet metal are the best, in the box can be placed in a suitable amount of humidity within a desiccant to reduce relative humidity compatible to reduce and prevent harmful gases of treasury erosion.

In order to prevent the anti-corrosion treatment of non-standard screws, it has been degreased, and the rust-proof screw nuts in the Nasdaq rust-removal and anti-rust agent water tank are swimming, or the zinc and chromium compounds on the metal surface are used to form a protective film on the metal surface, forming a spray method, and After drying, cooling, and repeating the process once, the resulting thickness of about 58 μ, silver-grey, based on the information provided by the manufacturer of the display, is said to have good rust and corrosion resistance.

Phosphate treatment is a chemical treatment of phosphate containing metal to metal surface to form a phosphate protective film. Phosphating treatment solution, insoluble in water, and has excellent adhesion of phosphate film, as its main purpose for bottom layers and coatings A metal layer that cold adsorbs lubricants. Since the phosphate coating is composed of a series of crystals of zinc, manganese, hydrogen phosphate and iron phosphate of different sizes, the film is porous, has a large specific surface area, and has a good absorption, adsorption coating or a large amount of lubricant , so it is often used as a primer, or cold stamping to reduce friction and steel, cold drawn steel wire as a lubricating layer.

Oxidized steel parts will be immersed in an alkaline treatment solution containing an oxidizing agent, such as nitric acid in potassium hydroxide or sodium hydroxide solution, and maintain its boiling point at about 140°C, or nitric acid and sodium hydrogen nitrate dipped steel parts in molten salt , it is pleasant to remove its surface layer, with the eyes of the black iron oxide film in the composition with the mixture of ferrous oxide and iron oxide can be obtained after quenching in water, is a method to improve the corrosion of iron metals!