新型低碳高强耐磨铸钢NMZ1在模拟海水中的腐蚀形貌  

Corrosion Resistance of a New Low-carbon High-strength Wear-resistant Cast Steel NMZ1

作　　者：曹晶晶[1,2] 马爱斌[1,2] 王秋月[2] 江静华[1,2] 陈建清[2] 周祺[2] 

机构地区：[1]河海大学水资源高效利用与工程安全国家工程研究中心,南京210098 [2]河海大学力学与材料学院,南京210098

出　　处：《腐蚀与防护》2011年第1期6-11,共6页Corrosion & Protection

基　　金：国家"十一五"科技支撑计划重大项目(No.2006BAA01A24-3)

摘　　要：借助全浸泡试验和腐蚀表面形貌观察,研究了新型低碳、高硅海洋用钢NMZ1在模拟静态海水中的腐蚀行为,并以常用离心泵叶轮材料20Cr5Cu及泥浆输送管道材料Q345为对比,评价其耐蚀性。结果表明,NMZ1钢的耐海水腐蚀性能优于Q345而不及20Cr5Cu,其在3.5%NaCl中的腐蚀速率为0.1215mm/a,约为Q345的2/3和20Cr5Cu的1.5倍;其合金化元素有助于提高表面产物膜的保护性并抑制点蚀发生,故其表现出均匀腐蚀形态且腐蚀速率较低。The corrosion behavior of a new wear-resistant cast marine steel NMZ1 with low carbon and high silicon was mvesugated in simulated sea-water by means of immersion test and corrosion-surface-morphology observation. The corrosion resistance had been evaluated by comparing the weight-loss with that of 20CrSCu for centrifugal pump impeller and Q345 for slurry pipeline. The results showed that sea-water corrosion resistance of NMZ1 was superior to that of Q345 but inferior to that of 20Cr5Cu. The corrosion rate of NMZ1 was 0. 1215 mm/a in the 3. 5% （wt） NaCl solution, which was about 2/3 of Q345 and 1.5 times of 20Cr5Cu. Alloying elements of NMZ1 could improve the protection of surface products and inhibit the occurrence of pitting, thus the alloy obtained a lower corrosion rate with uniform corrosion morphology.

关 键 词：耐蚀性 耐磨铸钢 浸泡试验 点蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理]