NaCl污染土中含水量和电阻率对腐蚀速率的影响

Moisture Content and Resistivity Influence on Corrosion Rate of Soil Polluted by NaCl

以太原典型粉土为研究对象,采用失重法测试经过14 d、28 d、56 d后,X70钢在Na Cl污染粉土中的腐蚀速率。试验结果显示,随着含水量的增加,腐蚀速率呈现出先增大后减小的趋势;且在含水量17%左右时,腐蚀速率达到一个峰值;在通常含水量情况下,随着电阻率的增大,其腐蚀速率减小;当含水量在17%左右、电阻率较小的情况下,土壤的腐蚀速率达最大;当含水量很小或者达到饱和时,无论土壤电阻率怎样变化,其腐蚀速率都达到最小。

By the typical silty soil in Taiyuan as the research object,and using the weightlessness method test after 14 d,28 d,56 d,The X70 steel in Na Cl contaminated silt corrosion rate. The test results show that the corrosion rate presents the first increase and then decrease with the increased water content,and the corrosion rate reached a peak when the water content of about 17%; In the usual case containing water and with the increase of resistivity,the corrosion rate decreases; When the moisture content is about 17% undering the condition of low resistivity,the soil corrosion rate reaches a maximum; No matter how variation of soil resistivity when the moisture content is very small or reaches saturation that the corrosion rate minimum.