论文部分内容阅读
研究了在1173K温度的90Na_2SO_4-10K_2SO_4熔融盐中,单渗铝涂层和铂改性的渗铝涂层LDC-2的腐蚀行为和它们的电位关系。两种涂层都有一钝化电位区,在此电位区内,涂层表面可能生成保护性氧化膜,但单渗铝涂层的腐蚀速度高于LDC-2涂层。后者的钝化电位区较前者宽300mV。这两种涂层的酸性熔融腐蚀临界电位值十分接近。但碱性熔融临界电位差达约400mV,LDC-2涂层耐碱性熔融性能远优于单渗铝涂层。对于铂改进渗铝涂层抗碱性熔融腐性蚀能的机构,也进行了探讨。
The corrosion behavior of single aluminized coating and platinum-modified aluminized coating LDC-2 was studied in 90Na_2SO_4-10K_2SO_4 molten salt at 1173K and their potential relationships. Both coatings have a passivation potential region where a protective oxide film may form on the surface of the coating, but the corrosion rate of the single aluminizing coating is higher than that of the LDC-2 coating. The latter passivation potential area than the former 300mV wide. The critical melting point potential values for these two coatings are very close. However, the difference of basic melting potential is about 400mV, and the LDC-2 coating is far superior to single-aluminate coating in alkali resistance. For platinum to improve the aluminized coating anti-alkaline corrosion of molten corrosion mechanism is also discussed.