船用低合金钢焊接件腐蚀行为研究
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摘要
目的研究船用低合金钢焊接件在海水中的腐蚀行为。方法采用金相组织观察、极化曲线、电化学阻抗谱测试,以及扫描振动电极技术(SVET),对船用低合金钢焊接件在天然海水中的腐蚀行为进行研究。结果船用低合金钢焊接件中热影响区与焊缝区及母材区金相组织发生明显分化,热影响区腐蚀倾向最大,耐蚀性最差,并且易与母材区形成电偶发生破坏。SVET测试结果表明,最大阳极电流出现在热影响区,随着浸泡时间的延长集中于靠近母材处。结论焊接件各区域间组织存在较大差异,热影响区成为最易发生腐蚀破坏的区域,在海水中阳极反应发生在热影响区,随浸泡时间延长电流增大,腐蚀加重。
Objective To study corrosion behaviors of low-alloy hull steel in seawater. Methods Corrosion behaviors of low-alloy hull steel were studied by metallurgical structure observing, potentiodynamic scanning, electrochemical impedance spectroscopy(EIS), and scanning vibration electrode test. Results There was obvious difference among metallographic structures in basement zone(BZ), heat-affected zone(HAZ) and weld zone(WZ). HAZ tended to have corrosion firstly, while the corrosion resistance of which was the lowest. And there was the probability of galvanic corrosion between HAZ and BZ. The result of SVET showed that the highest anodic current appeared in HAZ, and concentrated near BS as the time went on. Conclusion There are obvious differences among metallurgical structures in different zones, while HAZ turns out to be prior to corrode. Anodic reaction occurs at HAZ, and the max anodic current and corrosion increase with time.
Objective To study corrosion behaviors of low-alloy hull steel in seawater. Methods Corrosion behaviors of low-alloy hull steel were studied by metallurgical structure observing, potentiodynamic scanning, electrochemical impedance spectroscopy(EIS), and scanning vibration electrode test. Results There was obvious difference among metallographic structures in basement zone(BZ), heat-affected zone(HAZ) and weld zone(WZ). HAZ tended to have corrosion firstly, while the corrosion resistance of which was the lowest. And there was the probability of galvanic corrosion between HAZ and BZ. The result of SVET showed that the highest anodic current appeared in HAZ, and concentrated near BS as the time went on. Conclusion There are obvious differences among metallurgical structures in different zones, while HAZ turns out to be prior to corrode. Anodic reaction occurs at HAZ, and the max anodic current and corrosion increase with time.
引文
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[18]王力伟,杜翠薇,刘智勇,等.X70钢焊接接头在酸性溶液中的局部腐蚀SVET研究[J].腐蚀与防护,2012,33(11):935—939.
[2]赵艳君,许立伟,阎良萍,等.高强高韧低合金锰钢的研制[J].北京科技大学学报,2010,32(2):196—200.
[3]翁宇庆,杨才福,尚成嘉.低合金钢在中国的发展现状与趋势[J].钢铁,2011,46(9):1—10.
[4]东涛,刘嘉禾.我国低合金钢及微合金钢的发展问题和方向[J].钢铁,2000,35(11):71—75.
[5]李晓刚.材料腐蚀与防护[M].长沙:中南大学出版社,2009.
[6]ELIAZ N,SHACHAR A,TAL B,et al.Characteristics of Hydrogen Embrittlement,Stress Corrosion Cracking and Tempered Martensite Embrittlement in High-strength Steels[J].Engineering Failure Analysis,2002(9):167—184.
[7]PENG Qun-jia,XUE He,HOU Juan,et al.Role of Water Chemistry and Microstructure in Stress Corrosion Cracking in the Fusion Boundary Region of an Alloy182-A533B Low Alloy Steel Dissimilar Weld Joint in High Temperature Water[J].Corrosion Science,2011(53):4309—4317.
[8]HOU Juan,PENG Qun-jia,TAKEDA Y,et al.Microstructure and Stress Corrosion Cracking of the Fusion Boundary Region in an Alloy 182-A533B Low Alloy Steel Dissimilar Weld Joint[J].Corrosion Science,2010(52):3949—3954.
[9]KIM W K,KOH S U,YANG B Y,et al.Effect of Environmental and Metallurgical Factors on Hydrogen Induced Cracking of HSLA Steels[J].Corrosion Science,2008(50):3336—3342.
[10]BASTOS A C,SIM?ES A M,FERREIRAA M G.Corrosion of Electrogalvanized Steel in 0.1 M Na Cl Studied by SVET[J].Portugaliae Electrochimica Acta,2003(21):371—387.
[11]OLTRA R,MAURICE V,AKID R,et al.Local Probe Techniques for Corrosion Research[J].Crc Press,2007.
[12]DESHPANDE K B.Experimental Investigation of Galvanic Corrosion:Comparison between SVET and Immersion Techniques[J].Corrosion Science,2010,52(9):2819—2826.
[13]SIM?ES A M,BASTOS A C,FERREIRA M G,et al.Use of SVET and SECM to Study the Galvanic Corrosion of an Iron–zinc Cell[J].Corrosion Science,2007,49(2):726—739.
[14]WANG S,DING J,MING H,et al.Characterization of Low Alloy Ferritic Steel–Ni Base Alloy Dissimilar Metal Weld Interface by SPM Techniques,SEM/EDS,TEM/EDS and SVET[J].Materials Characterization,2015,100:50—60.
[15]WANG L W,LIU Z Y,CUI Z Y,et al.In Situ Corrosion Characterization of Simulated Weld Heat Affected Zone on API X80 Pipeline Steel[J].Corrosion Science,2014,85(1):401—410.
[16]LUO S J,WANG R.Identification of the Selective Corrosion Existing at the Seam Weld of Electric Resistance-welded Pipes[J].Corrosion Science,2014,87(5):517—520.
[17]ZOU Y,KONG X F,BAI Q,et al.Corrosion Behavior of Dissimilar Metal Weld Joint by Underwater[C]//The International Conference on Machinery,Materials Science and Energy Engineering.2015.
[18]王力伟,杜翠薇,刘智勇,等.X70钢焊接接头在酸性溶液中的局部腐蚀SVET研究[J].腐蚀与防护,2012,33(11):935—939.
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