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Passivation principle for rust prevention treatment
Release date:
2016/06/21
The mechanism of passivation can be explained by the thin-film theory, which posits that passivation occurs when a metal reacts with an oxidizing agent, forming an extremely thin, dense, highly protective, and firmly adherent passivating film on the metal’s surface. This film exists as a distinct phase and is typically composed of compounds formed by the oxidation of the metal. It serves to completely isolate the metal from the corrosive medium, preventing direct contact between the metal and the corrosive environment, thereby essentially halting the metal’s dissolution and achieving a passive state that provides corrosion resistance.
Each year, worldwide steel losses due to corrosion account for approximately 15% to 20% of total steel production, resulting in enormous economic losses and resource waste. Chongqing Dayou Surface Technology Co., Ltd. is a high-tech enterprise supported by the National Science and Technology Innovation Fund. Since its establishment, the company has been dedicated to research and development in neutral salt spray testing, rust prevention treatments, heavy-duty anti-corrosion technologies, offshore anti-corrosion solutions, and black metal anti-corrosion technologies. To date, the company holds five invention patents and twelve utility model patents. Our “Zinc-Nickel Diffusion Coating Process for Black Metal Anti-Corrosion” has won the Gold Award for National Invention Patent. The high-corrosion-resistant and high-wear-resistant dual-high series bolts produced by our company have been recognized as “Chongqing High-Tech Products,” and we have already filed an invention patent application with the State Intellectual Property Office.
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