347H不锈钢电化学腐蚀行为研究

使用电化学工作站检测热轧态347H不锈钢、固溶态酸洗347H不锈钢和固溶处理态347H不锈钢在3.5wt.%NaCl、5wt.%H₂SO₄和5wt.%NaOH腐蚀介质中的电化学腐蚀行为,绘制极化曲线和电化学阻抗谱研究固溶处理对347H不锈钢电化学腐蚀行为的影响.结果表明:在3.5wt.%NaCl腐蚀介质中,固溶态酸洗347H不锈钢表现出最佳的耐腐蚀性,而固溶处理会降低热轧态347H不锈钢的耐腐蚀性能.在5wt.%H₂SO₄腐蚀介质中,通过1 160 ℃固溶处理2 h,347H不锈钢的耐腐蚀性有所提高.在5wt.%NaOH腐蚀介质中,热轧态347H不锈钢的自腐蚀电流密度和其他状态的347H不锈钢相比要小一个数量级,因此,热轧态347H不锈钢更耐5wt.%NaOH腐蚀介质的腐蚀.

Study on electrochemical corrosion of 347H stainless steel

Electrochemical workstations were used to detect the electrochemical corrosivity of hot-rolled 347H stainless steel, solution pickled 347H stainless steel and solution treated 347H stainless steel in corrosive media 3.5wt.%NaCl, 5%wt.%H₂SO₄ and 5wt.%NaOH.The effect of solution treatment on the electrochemical corrosion behavior of 347H stainless steel was studied by drawing polarization curves and electrochemical impedance spectroscopy. The results showed that in the 3.5wt.%NaCl corrosion medium, solid solution pickling 347H stainless steel shows the best corrosion resistance, while solid solution treatment reduces the corrosion resistance of 347H stainless steel. In 5wt.%H₂SO₄ corrosion medium, corrosion resistance through 1 160 ℃ solid solution treatment with 2 h,347H stainless steel has been improved. The self-corrosion current density of hot-rolled 347H stainless steel in 5wt.%NaOH corrosion medium is an order of magnitude smaller than that of other 347H stainless steel. Therefore, hot-rolled 347H stainless steel is more resistant to corrosion of 5wt.%NaOH corrosion medium.