Coupon immersion tests were performed on 316L stainless steel in a simulated oilfield environment to evaluate the effect of H₂S partial pressure on pit depth and density. Pitting was most significant at intermediate partial pressures of H₂S, for which free H₂S in the pit solution is maximised. Inhibition of pitting at higher partial pressures is attributed to blocking of the pit surface by metal sulphide phases. The key role of pH in the pit solution is to determine the solubility of metal sulphides and the availability of free H₂S to adsorb on the reacting pit surface and sustain activity.

中文翻译：

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H2S对油田盐水中316L不锈钢点蚀的影响

在模拟油田环境中对 316L 不锈钢进行试片浸泡试验，以评估 H ₂ S 分压对坑深度和密度的影响。_{点蚀在 H 2} S的中间分压下最为显着，此时点蚀溶液中的游离 H ₂ S 最大化。在较高分压下对点蚀的抑制归因于金属硫化物相对点蚀表面的阻塞。坑溶液中 pH 值的关键作用是确定金属硫化物的溶解度和游离 H ₂ S 吸附在反应坑表面和维持活性的可用性。