Hot-dip galvanized bolts are a relatively good surface for rust prevention, but they also appear to be rusty in the face of natural weathering and corrosion. In order to avoid this phenomenon, the following measures are mainly taken.
First, we need to pack the hot-dip galvanized bolts after galvanizing. A reasonable choice of packaging can effectively avoid rust and prolong the service life. For example, galvanized iron sheet metal is the best, and it can be placed in a desiccant with an appropriate amount of humidity in the box to reduce the relative humidity, reduce compatibility and prevent the erosion of harmful gases.
In order to prevent the anti-corrosion treatment of non-standard screws, the anti-corrosion treatment has been degreasing, and the anti-rust screw and nut in the rust and anti-rust agent water tank, or the use of zinc and chromium compounds to form a protective film on the metal surface, forming a spray method, and drying and cooling , And then repeat the process once.
Phosphate treatment is a phosphate chemical treatment containing metal to the metal surface to form a phosphate protective film. Phosphating treatment solution is insoluble in water and has excellent adhesion of the phosphate film. It is the main purpose of the bottom layer and coating. Metal layer for cold adsorption of lubricant. Since the phosphate film is composed of a series of zinc, manganese, hydrogen phosphate and iron phosphate crystals of different sizes, the film is porous, has a large specific surface area, 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 lubrication layer
