3 drywall screws

The development of iron wire industry in our country is still very good, among which there is a kind of iron wire called large roll galvanized wire, which is also widely used with its own good performance. In fact, the zinc layer plays a protective effect on the iron wire inside, which can ensure that the iron wire is not oxidized, and it is convenient and beautiful to use. Galvanized iron wire is formed by pickling, high temperature, hot dip galvanizing and other steps. It has good toughness and elasticity and can be applied to many civil fields.

Large roll galvanized wire phosphating film is dark gray to black gray, the thickness is generally 5-20μm, has better corrosion resistance in the atmosphere. Membrane is a microporous structure, strong adsorption ability to paint, such as used as paint bottom, corrosion resistance can be further advanced. Metal oxidation treatment: Add steel products to NaOH and NaNO2 mixed solution, heating treatment, the surface can form a layer of thickness of about 0.5-1.5μm blue oxide film, in order to reach the purpose of steel corrosion prevention, this process is called blue treatment, referred to as blue.

Hot dip galvanizing is to remove oil from the workpiece, pickling, dipping, drying after dipping into the dissolved zinc solution for a certain time, can be brought out. Hot dip galvanizing is an effective way to prevent corrosion of metal. It is mainly used for metal structure facilities in various industries. It is to immerse the steel parts after rust removal into the melting zinc liquid at about 500℃, so that the surface of the steel members is attached with zinc layer, so as to play the purpose of anti-corrosion. The galvanized layer is more firm.