双相不锈钢表面处理工艺对化学品船压载舱涂层防护性能的影响  

Effect of Stainless Steel Surface Treatment Technologies on Coating Protection Performance in Ballast Tank of Duplex Stainless Steel Chemical Tankers

作　　者：曾登峰 闫林玉 吴佩 金健博 赵云涛 陶乃旺 ZENG Dengfeng;YAN Linyu;WU Pei;JIN Jianbo;ZHAO Yuntao;TAO Naiwang(Xiamen Branch of Luoyang Ship Material Research Institute,Xiamen,Fujian 361106,China;DNV China Company Limited,Shanghai 200219,China;Hudong Zhonghua Shipbuilding(Group)Co.,Ltd.,Shanghai 200219,China)

机构地区：[1]中国船舶集团有限公司第七二五研究所,海洋腐蚀与防护全国重点实验室,福建厦门361106 [2]挪威船级社(中国)有限公司,上海200219 [3]沪东中华造船有限公司,上海200219

出　　处：《涂料工业》2024年第10期60-67,共8页Paint & Coatings Industry

摘　　要：采用棕刚玉喷砂、铸钢钢砂喷砂以及铸钢钢砂喷砂后棕刚玉扫砂3种喷砂工艺对2205双相不锈钢表面进行处理,通过能谱法及极化曲线法表征处理后的2205双相不锈钢表面状态差异,并采用模拟压载舱试验测试经过这3种喷砂工艺处理后的化学品船液货舱双相不锈钢外壁防护涂层的防腐性能,对比分析B级船体结构钢、2205双相不锈钢以及B级船体结构钢与2205双相不锈钢焊接3种不同基材压载舱保护涂层腐蚀蔓延及阴极剥离结果。结果表明:3种喷砂工艺均会在双相不锈钢基材表面形成磨料残留;钢砂磨料残留使得双相不锈钢腐蚀电位负移,耐腐蚀性变差;在有阴极保护的情况下,采用钢砂喷砂处理的双相不锈钢表面残留的钢砂磨料因小阳极效应使涂层耐阴极剥离性能降低。在海水介质中,B级船体结构钢与双相不锈钢焊接容易因电偶腐蚀导致双相不锈钢表面防护涂层加速失效。The surface state difference of 2205 duplex stainless steel after brown corundum sandblasting,cast steel sandblasting,and cast steel sandblasting followed by brown corundum sand sweeping was characterized by scanning energy spectrum method and polarization curve method.The simulated ballast tank test was carried out to test the anticorrosive properties of the coating which was applied on the duplex stainless steel outer wall of the liquid tank of the chemical tanker after the three sandblasting processes.The corrosion creep and cathodic disbonding results of the protective coating on the ballast tank of B-class marine steel,duplex stainless steel and welding of B-class marine steel and duplex stainless steel substrates were obtained.The results showed that abrasive residue could be formed on the surface of duplex stainless steel substrate by three sandblasting processes;The abrasive residue of steel sand made the corrosion potential of duplex stainless steel shift negatively,and the corrosion resistance deteriorates;In the case of cathodic protection,the steel sand abrasive residue on the surface of duplex stainless steel could reduce the cathodic disbonding resistance of the coating due to small anode effect.In the seawater,the failure of protective coating which was applied on the duplex stainless steel welding by B-class marine steel tended to accelerate due to the galvanic corrosion.

关 键 词：双相不锈钢 化学品船压载舱 表面处理 防护涂层 喷砂 能谱 极化曲线 

分 类 号：TQ639.1[化学工程—精细化工]