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针对油罐腐蚀的现象进行了环境因素影响的调查。从实验室的测试中发现水含量是影响局部腐蚀的最重要的因素, 当水含量在12wt%时, 局部腐蚀率最大。虽然温度和氯化物的聚集加快了局部腐蚀, 但相对于水含量的影响是微不足道的。通过观察, 局部腐蚀是发生在粘有细砂金属表面的正下方, 因此对腐蚀凹陷部分与外界环境之间所形成的氧化层扩散进行了探讨, 对SS400钢板和镀锌板局部腐蚀的极值做了统计分析, 其结果是相同的。喷雾腐蚀试验中, 尽管表面的湿度相同, 但由于氯化物的聚集也是导致加速局部腐蚀的因素, 当浓度小于1000ppm时对其影响很小。从SS400钢板和镀锌板局部腐蚀程度的统计分析看,与砂中掩埋试验基本相同, 都显示了相同的平行指数分布。基于对数据的统计和模拟腐蚀测试, 提供了在现场油罐底部由氧气纹路细胞所形成的腐蚀变化过程的预测。
Aiming at the phenomenon of corrosion of oil tank, the influence of environmental factors was investigated. From the laboratory tests found that water content is the most important factor affecting the local corrosion, when the water content of 12wt%, the maximum local corrosion rate. Although temperature and chloride accumulation accelerate localized corrosion, the effect relative to water content is negligible. Through observation, local corrosion occurs just below the surface of the fine sand metal, so the diffusion of oxide layer formed between the corrosion recess and the external environment is discussed. The extreme corrosion of SS400 steel and galvanized steel Do the statistical analysis, the result is the same. Spray corrosion test, although the surface of the same humidity, but due to the accumulation of chloride is also contributed to accelerate the local corrosion factor, when the concentration is less than 1000ppm had little effect. From the statistical analysis of the local corrosion degree of SS400 steel plate and galvanized steel plate, the same parallel exponential distribution is shown as the same as the buried test in sand. Based on statistical and simulated corrosion testing of the data, a prediction of the process of corrosion alteration formed by oxygen line cells at the bottom of the tank is provided.