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应用自行建立的阵列参比电极技术,原位测量316不锈钢焊接样品在12%FeCl3溶液中腐蚀电位分布.同时借助电化学极化曲线、交流阻抗技术和扫描Kelvin探针对316不锈钢焊缝腐蚀进行跟踪检测.结果表明,经焊接的316不锈钢样品在12%FeCl3溶液中,最初时刻焊缝区发生优先腐蚀,而在母材区保持钝化状态;随着浸泡时间延长,焊缝区电位不断负移,局部腐蚀加剧,并达到最大值;浸泡45 min,母材局部位发生电位负移,并出现腐蚀.扫描Kelvin探针(SKP)和金相观察的结果表明,焊缝有较高的腐蚀敏感性;金属焊接过程材料组织和成分的变化是导致316不锈钢焊接样品发生局部腐蚀的主要原因.
The corrosion potential distribution of 316 stainless steel welding samples in 12% FeCl3 solution was measured in-situ by using the self-established array reference electrode technique. The corrosion of 316 stainless steel weld was also investigated by means of electrochemical polarization curve, AC impedance technique and scanning Kelvin probe The results show that the weld 316 stainless steel samples in the 12% FeCl3 solution, the initial weld seam area preferentially corroded, while maintaining the passivation state in the parent material area; as the soaking time, the weld area potential negative And the local corrosion intensified and reached the maximum value. After soaking for 45 min, the local potential of the base material was negatively shifted and corroded. The results of scanning Kelvin probe (SKP) and metallographic observation showed that the weld had high corrosion Sensitivity; changes in the material composition and composition of the metal welding process are the main causes of localized corrosion of the 316 stainless steel weld samples.