The development of corrosion resistant steel for molten Al has always attracted the interests from die casting industry for several decades. In this paper, we reported the enhanced corrosion resistance in 750 °C molten Al of an alumina-forming austenitic steel (AFA) via deliberately producing oxide layer after different high-temperature oxidation processes. The results showed that the corrosion resistance against molten Al of the AFA was improved significantly due to the presence of a stable, compact and continuous oxides barrier, in comparison with H13 tool steel as well as unoxidized AFA without Al2O3 film. Apparently, the non-wetting α-Al2O3 film, which was formed after high-temperature oxidation, effectively protected the substrate from inner-diffusion and penetration of the molten Al. These findings provide one of cost-effective ways to improve the corrosion resistance of steels against molten Al.

中文翻译：

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形成氧化铝的奥氏体钢对熔融铝的增强耐蚀性

几十年来，铝液用耐腐蚀钢的开发一直吸引着压铸行业的兴趣。在本文中，我们通过在不同的高温氧化过程后故意产生氧化层，报告了形成氧化铝的奥氏体钢 (AFA) 在 750 °C 熔融铝中的耐腐蚀性能增强。结果表明，与 H13 工具钢以及没有 Al2O3 膜的未氧化 AFA 相比，由于存在稳定、致密和连续的氧化物阻挡层，AFA 对熔融铝的耐腐蚀性能显着提高。显然，高温氧化后形成的不润湿的α-Al2O3薄膜有效地保护了基体免受熔融铝的内部扩散和渗透。