久久青草精品欧美日韩精品,97人妻无码一区二区精品免费,老司机性色福利精品视频,亚洲女线av影视宅男宅女天堂

At present, the domestic anticorrosive insulation pipeline produced by 3pe anticorrosive equipment has a very broad market prospect and has been widely used in various fields. The selection of cement mortar corrosion resistant steel pipe to make highway Bridges not only saves steel, but also simplifies the construction. Together, it can greatly reduce the protective layer, save capital and reduce costs. What are the requirements for the steel pipe produced by the three pe anti-corrosion equipment?
The polyethylene anticorrosive insulation pipe produced by 3pe anticorrosive equipment should have the characteristics of strong anticorrosive sealing ability, convenient construction, high mechanical strength, stable quality, good applicability, good water resistance, and no environmental pollution.

With the development of society, some pipes require insulation and anti-corrosion. Oil is a corrosive mixture. So we need to avoid corrosion. The molten metal is directly buried in the anti-corrosion steel pipe, reacts with the iron base to form an alloy layer, and combines with the coating to remove the iron oxide on the surface of the steel pipe. After pickling, wash with a mixed solution of ammonium chloride and zinc chloride, and then feed into the hot dip galvanizing tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.