Understanding the role of Ti addition on the corrosion and passive film characteristics of Nb stabilized AISI 347 weld

Materials and Corrosion Pub Date : 2022-05-04 DOI:10.1002/maco.202213158

Dikshant Malhotra, A. S. Shahi

{"title":"Understanding the role of Ti addition on the corrosion and passive film characteristics of Nb stabilized AISI 347 weld","authors":"Dikshant Malhotra, A. S. Shahi","doi":"10.1002/maco.202213158","DOIUrl":null,"url":null,"abstract":"A multipass multilayer weld pad was fabricated on AISI 347 base metal with filler combinations of AISI 321 and AISI 347, to understand the role of Ti addition on metallurgical, corrosion, and passive film characteristics of the AISI 347 weld. Weld layers with Nb content of 0.53 wt.%, 0.47 wt.%, 0.23 wt.% and Ti of 0 wt.%, 0.21 wt.%, 0.33 wt.%, respectively, were extracted from fabricated weld pad. Selected weld metal compositions were subjected to thermal aging at 750°C for 24 h to investigate the influence of varying precipitation induced in these welds. Ti addition in AISI 347 weld showed lower enrichment of C and Cr at dendritic regions resulting in reduced Cr depletion, lower sensitization, enhanced pitting potential, and repassivation ability compared to conventional Nb stabilized AISI 347 weld. Passive film characteristics studied by electrochemical impedance spectroscopy and X‐ray photoelectron spectroscopy depicted formation of more protective, and dense passive film with higher Cr, Ni, and O concentrations for Ti added AISI 347 weld relative to conventional ones. Therefore, Ti addition via the use of Ti stabilized filler in the Nb stabilized AISI 347 weld proved to be efficient in enhancing its corrosion performance by forming a more protective passive oxide film.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"39 1","pages":"1701 - 1716"},"PeriodicalIF":0.0000,"publicationDate":"2022-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials and Corrosion","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1002/maco.202213158","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 2

Abstract

A multipass multilayer weld pad was fabricated on AISI 347 base metal with filler combinations of AISI 321 and AISI 347, to understand the role of Ti addition on metallurgical, corrosion, and passive film characteristics of the AISI 347 weld. Weld layers with Nb content of 0.53 wt.%, 0.47 wt.%, 0.23 wt.% and Ti of 0 wt.%, 0.21 wt.%, 0.33 wt.%, respectively, were extracted from fabricated weld pad. Selected weld metal compositions were subjected to thermal aging at 750°C for 24 h to investigate the influence of varying precipitation induced in these welds. Ti addition in AISI 347 weld showed lower enrichment of C and Cr at dendritic regions resulting in reduced Cr depletion, lower sensitization, enhanced pitting potential, and repassivation ability compared to conventional Nb stabilized AISI 347 weld. Passive film characteristics studied by electrochemical impedance spectroscopy and X‐ray photoelectron spectroscopy depicted formation of more protective, and dense passive film with higher Cr, Ni, and O concentrations for Ti added AISI 347 weld relative to conventional ones. Therefore, Ti addition via the use of Ti stabilized filler in the Nb stabilized AISI 347 weld proved to be efficient in enhancing its corrosion performance by forming a more protective passive oxide film.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

了解Ti对Nb稳定AISI 347焊缝腐蚀及钝化膜特性的影响

采用AISI 321和AISI 347两种钎料组合在AISI 347母材上制备了多道次多层焊垫，研究了Ti添加对AISI 347焊缝的冶金、腐蚀和钝化膜特性的影响。焊层含铌量为0.53 wt。%， 0.47 wt。%， 0.23 wt。%和Ti (0 wt)。%， 0.21 wt。%， 0.33 wt。%，分别从预制焊垫中提取。选定的焊缝金属成分在750℃下热时效24 h，以研究在这些焊缝中引起的不同析出物的影响。与传统的Nb稳定的AISI 347焊缝相比，在AISI 347焊缝中加入Ti后，枝晶区C和Cr的富集程度较低，从而减少了Cr的损耗，降低了敏化程度，增强了点蚀电位和再钝化能力。通过电化学阻抗谱和X射线光电子能谱研究的钝化膜特性表明，与传统的钝化膜相比，添加Ti的AISI 347焊缝形成了更强的保护性和致密的钝化膜，其Cr、Ni和O浓度更高。因此，通过使用Ti稳定填料在Nb稳定的AISI 347焊缝中添加Ti，通过形成更具保护性的被动氧化膜，可以有效地提高其腐蚀性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Materials and Corrosion

自引率

0.00%

发文量