Corrosion behavior of dissimilar copper/brass joints welded by friction stir lap welding in alkaline solution

作     者：Kamran AMINI Farhad GHARAVI 

作者机构：Department of Mechanical EngineeringTiran BranchIslamic Azad UniversityIsfahanIran Center for Advanced Engineering ResearchMajlesi BranchIslamic Azad UniversityIsfahanIran Department of Materials EngineeringSirjan BranchIslamic Azad UniversitySirjanIran 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2019年第26卷第6期

页      面：1573-1581页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

主　　题：friction stir welding copper brass alloy corrosion behavior alkaline solution dissimilar joint 

摘      要：This study was done to evaluate the nugget zone(NZ)corrosion behavior of dissimilar copper/brass joints welded by friction stir lap welding(FSLW)in a solution of 0.015 mol/L borax(pH 9.3).To this end,dissimilar copper/brass plates were welded with two dissimilar heat inputs(low and high)during the welding *** high and low heat inputs were conducted with 710 r/min,16 mm/min and 450 r/min,25 mm/min,*** open circuit potential(OCP)measurements,electrochemical impedance spectroscopy(EIS)and Tafel polarization tests,the electrochemical behavior of the specimens in borate buffer solution was *** the help of scanning electron microscope(SEM),the morphology of welded specimen surfaces was examined after immersion in the test *** to the results,the NZ grain size and resistance improvement reduced due to the nugget zone corrosion with a decreased heat *** results obtained from Tafel polarization and EIS indicated the improved corrosion behavior of the welded specimen NZ with a decrease in the heat input during the welding process unlike the copper and brass ***,an increased heat input during the welding process shows a reduction in the conditions for forming the passive films with higher protection behavior.