Edgar C. Hornus , Martín A. Rodríguez , Ricardo M. Carranza , C. Mabel Giordano , Raúl B. Rebak
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引用次数: 4
Abstract
The crevice corrosion repassivation potential was determined by the Potentiodynamic–Galvanostatic-Potentiodynamic (PD–GS–PD) method. Alloys 625, C–22, C–22HS and HYBRID–BC1 were used. Specimens contained 24 artificially creviced spots formed by a ceramic washer (crevice former) wrapped with a PTFE tape. Crevice corrosion tests were performed in 0.1 mol/L and 1 mol/L NaCl solutions at temperatures between 20 and 90 °C, and CaCl2 5 mol/L solution at temperatures between 20 and 117 °C. The crevice corrosion resistance of the alloys increased in the following order: 625 < C–22 < C–22HS < HYBRID–BC1. The repassivation potential (ECO) showed the following relationship with temperature (T) and chloride concentration ([Cl−]) ECO = (a + b T) log [Cl−] + c T + d; where a, b, c and d are constants. At temperatures above 90 °C, ECO for alloy 625 stabilized at a minimum value of –0.26 VSCE.
采用动电位-恒流-动电位(PD-GS-PD)法测定缝隙腐蚀再钝化电位。采用625、C-22、C-22HS和HYBRID-BC1合金。样品包含24个人工裂缝点，这些裂缝点是由用聚四氟乙烯胶带包裹的陶瓷垫圈(裂缝形成器)形成的。在温度为20 ~ 90℃的0.1 mol/L和1 mol/L NaCl溶液和温度为20 ~ 117℃的5 mol/L CaCl2溶液中进行缝隙腐蚀试验。各合金的抗缝隙腐蚀性能提高的顺序为:625 <C-22 & lt;C-22HS & lt;HYBRID-BC1。再钝化电位(ECO)与温度(T)和氯离子浓度([Cl−])有如下关系:ECO = (a + b T) log [Cl−]+ c T + d;其中a b c d是常数。在高于90°C的温度下，625合金的ECO稳定在最小值-0.26 VSCE。
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