盐酸浓度对热轧不锈钢酸洗板表面质量的影响

Effect of Hydrochloric Acid on the Surface Integrity of Hot-Rolled Stainless Steel Sheets During Pickling Process

借助电化学方法、激光共聚焦显微镜和SEM等分析手段,研究了盐酸浓度对热轧铁素体不锈钢表面质量的影响作用.结果表明:在本实验条件下,随着盐酸浓度的增加,酸洗后不锈钢表面平整程度增加,但盐酸浓度过高存在较严重的晶间腐蚀现象.虽然酸洗后不锈钢的阴阳极极化曲线形状在弱极化区并没有发生太大的变化,但随着盐酸浓度的增加,不锈钢在溶液中的点蚀电位升高,并且容抗弧半径增大,表面耐蚀性增强.

Electrochemical method, laser scanning confocal microscopy （LSCM） and scanning electron microscope （SEM） were employed to investigate the effect of the hydrochloric acid on the surface integrity of hot-rolled ferritic stainless steel during pickling process. The results showed that with the increase of concentration of hydrochloric acid, the surface becomes smoother. However, high concentration results in severe intergranular corrosion. With the increase of hydrochloric acid content, the shapes of polarization curves in weak polarization area do not change obviously, but the pitting potential and the radiuses of capacitive loop increase, indicating that the corrosion resistance enhances.