新型Cu-Cr-Ni系耐海水腐蚀钢耐蚀性能及机理EI

针对海洋环境腐蚀特点,通过添加合金元素Cu,Cr和Ni开发一种新型船体用耐蚀钢(B-NS)。利用电化学实验、全浸实验和周浸实验对B-NS的耐蚀性能进行评估,同时通过扫描电镜和能谱对锈层截面形貌和成分进行分析。结果表明:合金元素的添加可有效降低B-NS钢的饱和电流密度和全浸以及周浸条件下的腐蚀速率,同时促进周浸条件下更加稳定、致密保护性锈层的生成。合金元素赋予B-NS钢优异耐腐蚀性能,主要表现在提高B-NS钢热力学稳定性,促进锈层生成以阻挡侵蚀性介质腐蚀基底和赋予锈层阳离子选择性,阻止Cl-渗透进锈层。

Corrosion resistance and mechanism of new type Cu-Cr-Ni seawater corrosion-resistant steel

A new type of corrosion-resistant steel (B-NS) for ship hull was developed by adding alloying elements Cu, Cr and Ni according to the corrosion characteristics of marine environment. The corrosion resistance of B-NS was investigated by electrochemical test, full immersion test and dry-wet cyclic test, and the cross-sectional morphology and composition of the rust layer were analyzed by scanning electron microscope and energy dispersive spectroscopy. The results show that the addition of alloying elements effectively reduces the saturated current density and corrosion rate of B-NS steel under full immersion and dry-wet cyclic test. The alloying elements promote the formation of a more stable and dense protective rust layer under dry-wet cyclic test. The alloying elements give B-NS ship plate steel excellent corrosion resistance mainly in improving the thermodynamic stability of B-NS ship plate steel, promoting the formation of rust layer to prevent aggressive media from corroding the substrate, and giving the rust layer cation-selective permeability to prevent Cl^- from penetrating into the rust layer.