摘要
目的对比分析硫酸盐雾试验和盐雾/SO2复合试验的环境效应及机理差异。方法针对硫酸盐雾试验和ASTM G85附录A4-X4中的盐雾/SO2复合试验两种酸性盐雾试验方法,选取3种金属试片(4130高强度合金钢镀铬、40CrNiSi合金钢镀镍、2A12铝合金导电氧化)和2种合金钢自锁螺母(30CrMnSiA镀镉钝化螺母、30CrMnSiA镀锌钝化螺母)作为试验对象,对其开展两种酸性盐雾试验条件下的腐蚀试验,采用扫描电子显微镜、能谱分析研究各试验件表面生成的腐蚀产物形貌及组分特征,对比分析两种试验条件下的环境效应及机理差异,并结合耦合多电极矩阵(CMAS)测试技术,对比分析两种酸性盐雾试验条件下的环境腐蚀性特点及严酷性差异,初步探讨了两种试验条件与外场舰载平台环境的相关性关系。结果盐雾/SO2复合试验条件下CMAS电极的腐蚀深度达到同周期硫酸盐雾试验下的10倍左右。盐雾/SO2复合试验下,试样表面腐蚀产物中均检测出S元素的存在。相比于硫酸盐雾试验,盐雾/SO2复合试验与外场舰载平台环境具有更好的一致性。结论美军现行的盐雾/SO2复合试验方法与外场舰载平台环境具有更好的相符性。
Objective To compare and analyze environmental effect and mechanism difference of vitriol fog test and salt spray/SO2 composite test. Methods In this work, three metal specimens (4130 Cr-plated specimen, 40CrNiSi Ni-plated specimen, 2A12 aluminum alloy specimen) and two self-locking nuts (30CrMnSiA Cd-plated nut, 30CrMnSiA Zn-plated nut) were selected as experimental samples to conduct corrosion tests under two different acid salt spray test conditions (sulfate salt spray test and salt/SO2 spray test in appendix A4-X4 of ASTM G85). SEM and EDS were used to investigate the morphology and chemical composition of the corrosion film formed on the samples. In this way, the environmental effects and mechanism differences between the two acetic acid-salt spray test conditions were compared and analyzed. Furthermore, CMAS technique was used to study the environmental corrosion severity differences between the two acid salt spray test conditions. Results Salt fog/SO2 composite test under the condition of CMAS electrode corrosion depth is about 10 times of that under the same cycle sulfate fog test. During salt fog/SO2 composite test, the sample surface corrosion products are detected of S element. Compared with sulfate fog test, salt spray/SO2 composite test and field carrier platform environment has better consistency. Conclusion The present salt/SO2 composite test of US arm is more consistent with the outfield environment.
作者
李明
朱金阳
李刚
朱蒙
傅耘
LI Ming;ZHU Jin-yang;LI Gang;ZHU Meng;FU Yun(China Aero-Polytechnology Establishment, Beijing 100028, China)
出处
《装备环境工程》
CAS
2019年第4期38-45,共8页
Equipment Environmental Engineering
