两种盐沉积对LY12铝合金大气腐蚀行为的影响①  

Effect of deposition of ammonium chloride and ammonium sulfate on atmospheric corrosion of LY12 alloy

作　　者：万晔[1] 任延杰[1] 严川伟[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

出　　处：《中国有色金属学报》2004年第7期1149-1155,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(59899144)

摘　　要：在温度为298K,相对湿度为(85±5)%的条件下,对硫酸铵和氯化铵两种盐沉积后的LY12铝合金大气腐蚀行为进行了研究。腐蚀动力学曲线表明:沉积硫酸铵和氯化铵的LY12样品比空白样品的腐蚀更为严重,而且经氯化铵沉积的样品比经硫酸铵沉积的样品腐蚀严重得多。采用傅里叶变换红外光谱、扫描电镜以及光电子能谱等微观方法研究了不同腐蚀周期样品表面的结构和形貌,结果表明腐蚀主要沿着盐沉积的区域进行,随着时间的延长,腐蚀产物的生成减缓了LY12合金的腐蚀质量损失。对两种盐沉积条件下LY12合金的腐蚀机理进行了讨论。The atmospheric corrosion of LY12 alloy deposited with (NH_4)_2SO_4 and NH_4Cl particles was investigated at 298 K with relative humidity of (85±5)%. The results show that: the samples deposited with NH_4Cl particles corrode more seriously than the samples with (NH_4)_2SO_4 particles. FTIR, SEM and XPS were utilized to study the development of corrosion process and characterization of corrosion products. The results also indicate that LY12 alloy contaminated by salts is corroded much faster than the clean samples, and corrosion of LY12 alloy initiates along the deposition area of (NH_4)_2SO_4 and NH_4Cl particles. A corrosion mechanism was proposed to explain the observation.

关 键 词：LYL2铝合金 盐沉积 大气腐蚀 

分 类 号：TG172.3[金属学及工艺—金属表面处理]