Fe-Cr-Ni合金碱性SCC的电化学研究
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Keywords: Fe-Cr-Ni,溶解电流,碱性SCC,电化学
Abstract:
采用控制电位下恒变形C环型试样研究了Fe-Cr-Ni合金(800M)在含硫代硫酸钠杂质的热浓碱溶液中的应力腐蚀破裂(SCC)行为，测量了C形环试样恒电位极化时的稳定溶解电流密度ist(稳定溶解速率).用电化学方法研究了腐蚀形貌与电位和ist的相互关系，发现ist随电位的变化呈单调增加趋势，ist为0.68mA/cm2～1.62mA/cm2，对应电位E/SCE=-30mV～40mV，C形环试样发生碱性SCC；当电位和ist为其它值时，发生全面腐蚀(含晶间腐蚀).
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