利用阵列电极技术与腐蚀埋片相结合的方法,以Q235钢为研究材料,经自然热带临海红壤埋片,研究了Q235钢的宏观非均匀腐蚀行为.结果表明:Q235钢材料在时间维度上和垂直地面的空间维度上皆发生非均匀腐蚀.时间维度上发生非均匀腐蚀的原因是降雨频率与降雨量对土壤湿度的影响,从而影响Q235钢的腐蚀环境;垂直地面的空间维度上发生非均匀腐蚀的原因是随土壤深度增加,土壤湿度变化、含氧量变化及土壤组成成分差异的影响.在0～90 cm深度土壤范围内,随土壤深度的增加,Q235钢的腐蚀速率增加.垂向埋于热带滨海红壤中的长尺寸Q235钢在30～50、80和140～150 cm 3个范围内,因电偶腐蚀影响,腐蚀速率较大.
The non-uniform corrosion of metal is easy to occur in soils,for the heterogeneity of soils.In this article,the macro non-uniform corrosion (MNC) behavior of carbon steel was researched by the wire beam electrode (WBE) technique,while the steel samples were buried in the tropical coastal red soil in a test site at Zhanjiang.The occurrence of MNC of carbon steel depended upon the length of buried time and the corresponding depth of the spot on the buried samples,of which the former may be ascribed to the change of soil moisture with the changing amount and frequency of rainfall within the buried term,and the later may be ascribed to the variation of the moisture content,oxygen content and composition of soil with the depth of soil.In the range (0～90 cm) of the soils depth,the corrosion rate increased with the increase of the soils depth.Much intensive corrosion could be observed for the long length samples of carbon steel by the soil depth around the ranges 30～50 cm,80 cm and 140～150 cm,which was resulted from the galvanic corrosion.
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