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研究了引进凝汽器钛管、国产凝汽器用工业纯钛TA2和316L不锈钢在海水中的阴极电化学行为。通过慢应变速率拉伸实验和断口显微形貌分析,研究了钛管在不同阴极极化电位下的氢脆敏感性,进而获得凝汽器在海水中合理的阴极保护电位参数。结果表明,316L不锈钢/钛结构的凝汽器在海水中会发生电偶腐蚀,造成不锈钢的腐蚀加速;为了降低产生氢脆的风险,钛管在海水中的电位不宜负于-0.7 V,在对凝汽器实施阴极保护时,电位最好维持在-0.50~-0.65 V之间(vsAg/AgCl电极)。据此对凝汽器进行了阴极保护设计,选用铁锰合金阳极对凝汽器进行保护,不仅能满足不锈钢的保护电位要求,取得了良好的保护效果,而且保障了设备长期运行的安全性和经济性。
The cathode electrochemical behavior of industrial pure titanium TA2 and 316L stainless steel for condenser made in China, which is introduced into titanium tube of condenser and condenser, is studied. Through slow strain rate tensile test and fracture morphology analysis, the hydrogen embrittlement sensitivity of titanium tube under different cathodic polarization potentials was studied, and then the reasonable CPP parameters of condenser in seawater were obtained. The results show that the condenser of 316L stainless steel / titanium structure is galvanically corroded in seawater, resulting in accelerated corrosion of stainless steel. In order to reduce the risk of hydrogen embrittlement, the potential of titanium tube in seawater should not be negative to -0.7 V, For cathodic protection of condensers, the potential is best maintained between -0.50 and -0.65 V (vsAg / AgCl electrode). Condenser cathode protection design accordingly, the choice of ferromanganese anode condenser for protection, not only to meet the protection of stainless steel potential requirements, and achieved good protection, and to protect the safety of long-term operation of the equipment and Economic.