因瓦合金箔电沉积的制备及其微观结构和耐蚀性

来源期刊：中南大学学报(自然科学版)2006年第2期

论文作者：罗北平 龚竹青 郑雅杰 杨余芳 陈梦君

文章页码：263 - 268

关键词：因瓦合金;合金箔;电沉积工艺;微观结构;表面形貌;腐蚀性能

Key words：invar alloy; alloy foil; electrodeposited technology; microstructure; surface morphology; corrosion resistance

摘    要：在含有复配稳定剂和添加剂的高铁硫酸盐氯化物电解液中,电沉积得到因瓦合金箔。研究电沉积过程中对合金箔组成的影响因素以及合金箔的耐腐蚀性能。研究结果表明:电解液组成、电流密度、温度及pH值对合金箔组成的影响较大;在阴、阳极面积比为1.0∶2.0,镍、铁阳极面积比为1.8∶1.0的条件下,因瓦合金箔组成稳定,Fe的质量分数为(64±2)%;合金箔晶粒细小,尺寸均匀,结构紧密,表面光滑平整,无孔洞和裂纹,呈铁镍固溶体和面心立方晶体结构,表现出较强的(111)和(200)晶面择优取向;因瓦合金箔分别在10%硫酸溶液、10%氢氧化钠溶液和3.5%氯化钠溶液中钝化稳定,钝化电位较宽,表现出良好的耐蚀性能。

Abstract: Invar alloy foil was electrodeposited from sulfate-chloride electrolyte containing composite stabilizer and additives. The influencing factors of composition and corrosion resistance of alloy foil were investigated. The results show that the composition of alloy foil correlates directly with electrolyte constituents, pH value, current density and temperature. Under the conditions that the area ratio of cathode to anode is 1.0∶2.0, the area ratio of Ni to Fe in anode is 1.8∶1.0, the iron content of the alloy foil is (64±2)%, the alloy foil with dense texture is uniform and delicate grain, the surface morphology is bright and smooth with free-pitting and cracking. The alloy foil is of crystalline structure with plane (111) and (200) strongly preferred orientation and solid solution of Ni in Fe. The alloy foil presents excellent corrosion resistance in 10% H2SO4,10% NaOH and 3.5% NaCl solution respectively and the range of passive potential is broader.