Abstract The exterior surfaces of cast iron pipes buried in clay soils for up to 129 years show clustering of pits of similar depth at progressively greater overall corrosion pit depth. Within experimental accuracy, the pit depth increments are approximately constant over the whole range of pit depth for each soil. They increase with lower soil pH and appear insensitive to other soil properties and to burial period. These new findings are interpreted relative to pitting electrochemical potential and compared with field observations for pitting in marine corrosion of steel. Implications for modelling maximum pit depth development are considered.

中文翻译：

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埋地铸铁管腐蚀坑深度的聚类

摘要 埋在粘土中长达 129 年的铸铁管道的外表面显示出在总体腐蚀坑深度逐渐增大时具有相似深度的坑的聚集。在实验精度内，每个土壤的坑深度增量在整个坑深度范围内近似恒定。它们随着土壤 pH 值的降低而增加，并且似乎对其他土壤特性和埋藏期不敏感。这些新发现是相对于点蚀电化学电位进行解释的，并与钢海洋腐蚀中点蚀的现场观察结果进行比较。考虑了对最大坑深度开发建模的影响。