Shandong Mengyu Metal Manufacturing Co., Ltd. is a company specializing in metal surface treatment materials, including cold storage pipes, pickling passivation phosphating pipes, internal and external rust removal hydraulic pipes, various sizes of cold storage pipes, 3087 phosphating pipes, pickled seamless steel pipes, pickled passivated seamless steel pipes, pickled phosphated seamless steel pipes, pickled saponified seamless steel pipes, pickled phosphated passivated processing, degreasing, rust removal, phosphating, passivation, oxidation, chrome-free passivation, galvanized chrome-free passivation, continuous hot galvanized chrome-free passivation, steel chrome-free passivation, magnesium alloy chrome-free passivation, chemical cleaning, degreasing and defatting, pickling and polishing, passivation sealing, painting and spraying, oxidation blackening, anodizing, and more.
The necessity of pipeline pickling: Equipment and pipelines in new installations generate a substantial amount of debris during the manufacturing, storage, transportation, and installation processes. This debris primarily includes: scale, iron oxide rust, silt, slag, welding flux, anti-rust oil, and surface coatings, etc.
The passivation mechanism is primarily explained by the film theory, which posits that passivation occurs due to the interaction between the metal and an oxidizing medium, forming a very thin, dense, and well-coated passivation film on the metal surface. This film exists as an independent phase, typically a compound of oxygen and metal. It acts as a complete barrier between the metal and the corrosive medium, preventing direct contact and thereby halting the metal's dissolution to achieve a passive state and prevent corrosion.
Compared to corrosion during pickling, equipment operation accidents caused by rolling scales, iron oxide rust, mud and sand, weld slag, rust prevention oil, and coatings pose a greater risk. Due to the clean metal surface obtained after chemical cleaning, products can be produced more quickly, resulting in substantial economic benefits for the factory, which far exceed the investment cost of the cleaning process.