ABSTRACT The corrosion behaviour of electrochemically induced surface annealed (EISA) 304L stainless steel was analysed using a range of electrochemical methods, such as polarisation, impedance and Mott–Schottky techniques. Secondary ion mass spectroscopy was used to examine the elemental distribution around the surface of an EISA-treated specimen. The results showed that the EISA treatment increases the resistance to pitting corrosion due to surface densification caused by the absorption of NO and/or N2, which had been reduced under cathodic polarisation during the EISA process. Owing to the limited annealing depth, however, the prolonged corrosion process (i.e. Fe dissolution) can lead to the dissolution of NO and/or N2 species, which had been absorbed on the outer surface, and only smaller portions remained with an uneven distribution at the surface. This can make the EISA-treated steel more vulnerable to corrosion.

中文翻译：

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电化学诱导表面退火对酸性环境下304L不锈钢腐蚀行为的影响

摘要 电化学诱导表面退火 (EISA) 304L 不锈钢的腐蚀行为使用一系列电化学方法进行分析，例如极化、阻抗和莫特-肖特基技术。二次离子质谱法用于检查经 EISA 处理的样品表面周围的元素分布。结果表明，由于吸收 NO 和/或 N2 引起的表面致密化，EISA 处理提高了对点蚀的抵抗力，而在 EISA 过程中，在阴极极化下这些物质已减少。然而，由于退火深度有限，长时间的腐蚀过程（即 Fe 溶解）会导致已吸收在外表面上的 NO 和/或 N2 物质溶解，只剩下较小的部分，表面分布不均匀。这会使经 EISA 处理的钢更容易受到腐蚀。