稀土(Ce／La)对碳素钢耐海洋性大气腐蚀影响的电化学研究  

Effect of Rare Earths (Cerium/Lanthanum) on the Corrosion Behavior of Carbon Steels in Ocean Atmosphere Studied by Electrochemistry

作　　者：汪兵[1] 刘清友[1] 刘小明[2] 毛新平[3] 王向东[1] 董瀚[1] 

机构地区：[1]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081 [2]本溪钢铁(集团)有限责任公司,辽宁本溪117000 [3]广州钢铁企业集团有限公司,广东广州510381

出　　处：《材料保护》2009年第1期56-58,共3页Materials Protection

基　　金：973国家重点基础研究项目“提高钢铁材料质量和使用寿命的冶金学基础研究”资助项目(2004cb619101);国家自然科学基金项目(50671027)

摘　　要：稀土元素提高钢铁材料耐大气腐蚀性能的机理已有多种解释,但它本身所具有的缓蚀特性对提高钢铁材料耐候性的机理没有深入研究报道。为此,使用极化曲线、交流阻抗测试、锈层微观分析等方法研究了Ce/La混合稀土对碳素结构钢耐海洋性大气腐蚀性能的影响。结果表明:在中性氯化钠溶液中,钢中加入稀土后自腐蚀电位负移,阴极反应受到阻碍;随着稀土含量的增加,试验钢的锈层变得较为致密,厚度减薄,裂纹和空洞也明显减少,锈层中的电荷传递电阻呈上升趋势,而锈层电阻成下降趋势。对稀土提高钢铁材料耐候性的缓蚀机理进行了讨论。Various mechanisms have been proposed to explain the increase of the anticorrosion behavior of i-ron and steels in atmosphere by rare earth addition,but few have been reported on the action of rare earths with corrosion-inhibition ability in increasing the weathering performance of iron and steels.Thus polarization curves and alternating current impedance spectra and microanalysis of the rusted layers were respectively measured and conducted to investigate the effect of mixed rare earth cerium and lanthanum on the corrosion behavior of carbon steels in ocean atmosphere.And the inhibition mechanisms for rare earths to improve the weathering performance of iron and steels were discussed.Results indicated that the introduction of the mixed rare earths in carbon steel caused negatively shift of the corrosion potential in neutral NaCl solution and retarded the cath-ode reaction.The rusted layers on the steels became increasingly compact and thinner with increasing content of the rare earths,while the amounts of cracks and cavities in the rusted layers were decreased.Moreover,the resistance for charge transfer in the rusted layers increased,and the resistance of the rusted layers decreased with increasing content of mixed rare earths.

关 键 词：混合稀土 Ce/La 碳素结构钢 耐海洋性大气腐蚀 电化学 

分 类 号：TG172.3[金属学及工艺—金属表面处理]