Pit initiation behavior at Ce-added and Ce-free CaS inclusions in Type 304 L stainless steel was investigated by microelectrochemical measurements. Stainless steel specimens containing artificial Ce-added and Ce-free CaS inclusions were fabricated by spark plasma sintering. The pit initiation resistance at the Ce-added CaS inclusions was higher than that at the Ce-free CaS inclusions. The surface of the Ce-free CaS inclusions largely dissolved during immersion in 0.1 M NaCl, while a large part of the Ce-added CaS inclusions remained undissolved. Thermodynamic calculation showed that CeS is less soluble than CaS.

中文翻译：

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不锈钢中CaS夹杂物中的铈添加物：不溶于水的夹杂物并提高抗点蚀性

通过微电化学测量研究了在304 L不锈钢中添加Ce和不含Ce的CaS夹杂物时的点蚀行为。通过火花等离子体烧结制备了包含人工添加的铈和不含铈的CaS夹杂物的不锈钢试样。添加Ce的CaS夹杂物的耐点蚀性高于不含Ce的CaS夹杂物。不含Ce的CaS夹杂物的表面在浸入0.1 M NaCl的过程中大部分溶解，而大部分Ce添加的CaS夹杂物仍然不溶解。热力学计算表明，CeS的溶解度低于CaS。