紫铜海水管焊接部位在人工海水中的腐蚀行为.pdf

《紫铜海水管焊接部位在人工海水中的腐蚀行为.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、第57卷第11期化工学报Vol.57No.11Z006年11月JournalofChemicalIndustryandEngineeringNovemberZ006妥、妥妥妥妥、妥妥研究论文妥紫铜海水管焊接部位在人工海水中的腐蚀行为妥、妥妥妥妥、妥王宏智1!陈君1!周建奇Z!姚素薇1!张卫国1<1天津大学化工学院应用化学系9天津30007Z;Z9Z854部队9广东湛江5Z4003>摘要C通过阳极极化曲线交流阻抗测试扫描电镜研究了紫铜海水管焊接部位在人工海水中的腐蚀行为.结果表明C紫铜白铜焊缝和黄铜焊缝在人工海水中的阳极过程

2、类似9相同电位下9白铜焊缝的电流密度最小9耐蚀性最佳9与阻抗测试结果一致.黄铜焊缝在电位-0.01ZV时出现电流峰9腐蚀产物膜多孔疏松9随后电极进入钝化区9钝化膜由CuZOCuCl和ZnO组成;随电位升高9钝化膜溶解9发生铜锌置换反应9沉积的Cu导致活性电对的形成9增加了合金的腐蚀速度;当电位为+0.87V时9电极表面富集了针状锡和锡的氧化物.随后9电极表面积累的锡和锡的氧化物及腐蚀产物层对脱锌腐蚀有一定的阻碍作用9电流密度有所下降9最后腐蚀达到一种动态平衡9腐蚀机制为溶解-再沉积机理.关键词!海水管;焊接;腐蚀;铜合金中图分类号!TG1

3、7Z文献标识码!A文章编号!0438-115711-Z677-05CorrosionbehaviorofWeldedointsofcoPPerPiPeinartificialseaWater1"CHENJun1"ZHOUJianCi2"YAOSuWei1"ZHANGWei9uo1WANGHon9Zhi<1SchoolofChemicalengineeringandTechnology9TianjinUniuersity9Tianjin30007Z9China;ZPLAUnitNo.9Z8549Zhanjiang5Z40039Gua

4、ngdong9China>Abstract!ThecorrosionbehavioroftheWeldedointsofcopperpipeinartificialseaWaterWasstudiedWithanodicpolarization9electrochemicalimpedancespectroscopyandscanningelectronmicroscopy.EXperimentresultsindicatedthattheanodicprocessesofcopper9cupronickel-Welded

5、ointandbrass-WeldedointWeresimilarinartificialseaWater.Atthesameelectrodepotential9thecorrosioncurrentofcupronickelWastheloWestandthecorrosionresistanceWasthebest9WhichisconsistentWiththeEISresult.ThecurrentdensitypeakofbrassWeldedlineappearedat-0.01ZV9andaporouscorrosionfi

6、lmWasformed.TheelectrodeWaspassivatedsubseCuently.ThepassivationfilmWasmadeupofCuZO9CuClandZnO.ThepassivationfilmdissolvedWithelectrodepotential9anddisplacementdepositiontookplacebetWeenCuandZn.Thecopperredepositionontheelectrodesurfaceinducedtheincreaseofelectrodeactivitya

7、ndcorrosionrate.Atanelectrodepotentialof+0.87V9theelectrodesurfaceWasrichofacicularSnandstannumoXide.ThisfilmWouldpreventtheelectrodefromdezincification9andthecurrentdensitydecreasedandhomeostasisWasreachedatthesametime.ThecorrosionmechanismofbrassWeldedlineinartificialseaW

8、aterWasdissolution/redeposition.KeyWords!seaWaterpipe;Weldedoint;corrosion;coppera