电阻法和方块电阻法连续监测A3钢在硫酸中的腐蚀深度

Monitoring of Corrosion Depth of A3 Steel in H_2SO_4 Solution by Continuously Measuring its Resistance or Sheet Resistance

采用电阻法、方块电阻法和失重法分别研究了棒状和板状A3钢在0.1M/L和0.5M/L H2SO4中连续的腐蚀深度变化。结果表明:用电阻法和方块电阻法获得的腐蚀深度与失重法获得的腐蚀深度具有很好的一致性,在腐蚀深度为7.07μm范围内,电阻法与失重法获得的腐蚀深度的差值小于0.90μm,平均差值为0.70μm,而方块电阻法与失重法获得的腐蚀深度的差值小于0.75μm,平均差值为0.42μm。与电阻法相比,方块电阻法获得的测量数据分散性小,可获得更接近于实际的腐蚀深度。

The corrosion depths of A3 steel bar and plate in 0. 1M/L and 0. 5M/L H2SO4 solutions were investigated by measuring their mass loss, resistance or sheet resistance changes, respectively. The results showed that the A3 steel corrosion depths resulted from mass loss were greatly consistent with those calculated from resistance or sheet resistance changes. Within the range of 7.07μm, the maximum and average differences of corrosion depths obtained from mass and resistance changes for A3 steel bar in the above solutions were 0.90μm and 0.70μm respectively, and those for the A3 steel plate from mass and sheet resistance changes were 0.75μm and 0.42μm. Compared with the data of measured resistances of A3 steel bar in 0. 1M/L and 0.5M/L H2SO4 solutions, the sheet resistances monitored of A3 steel plate in the same solutions were less scattered and their corresponding calculated corrosion depths were closer to those acquired from mass changes.