The effect of sodium chloride concentration on corrosion resistance of austenitic stainless steel 316L and SMA weldment

Andi Rustandi, Suganta Setiawan, Ihsan Fathurrahman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Austenitic stainless steel 316L has been widely used in marine environment which containing sodium chloride solution (NaCl). In order to provide matching properties with parent metal, filler metal SMA 316L is commonly produced with slightly over alloyed composition. This work investigated the corrosion behavior of base metal 316L and SMA 316L weld metal by using Electrochemical Impedance Spectroscopy (EIS) to evaluate the mechanism of corrosion behavior based on impedance magnitude measurement at room temperature (27oC ). Various concentrations of sodium chloride solution i.e 1%,2%,3.5%,4%, and 5% NaCl were prepared. Optical Metallography was also conducted to compare microstructure of base and weld metal. By using Nyquist graphs and its related equivalent circuit parameters showed that impedance magnitude of weld metal was higher which compared to base metal at any NaCl concentration. Metallography examination revealed that weld metal 316L had dendritic austenitic with delta ferrite and 316L base metal had austenite with typical twin boundaries structure. Higher chromium and nickel content in weld metal 316L was the key variable that control passive film characteristic rather than its microstructure. The lowest impedance magnitude of both 316L and all-weld metal 316L at various concentration was at 3.5% NaCl. Dissolved oxygen at 3.5% NaCl reach maximum solubility which causes severe pitting corrosion.

Original languageEnglish
Title of host publicationFunctional Materials and Metallurgy - ICFMM 2016
EditorsHaider F. Abdul Amir
PublisherTrans Tech Publications Ltd
Pages120-124
Number of pages5
ISBN (Print)9783035711110
DOIs
Publication statusPublished - 1 Jan 2017
EventInternational Conference on Functional Materials and Metallurgy, ICFMM 2016 - Shanghai, China
Duration: 3 Aug 20165 Aug 2016

Publication series

NameSolid State Phenomena
Volume263 SSP
ISSN (Electronic)1662-9779

Conference

ConferenceInternational Conference on Functional Materials and Metallurgy, ICFMM 2016
CountryChina
CityShanghai
Period3/08/165/08/16

Keywords

  • Corrosion resistance
  • Electrochemical impedance spectroscopy (EIS)
  • NaCl concentration
  • Shielded metal arc weldment (SMAW)
  • Stainless steel 316L

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  • Cite this

    Rustandi, A., Setiawan, S., & Fathurrahman, I. (2017). The effect of sodium chloride concentration on corrosion resistance of austenitic stainless steel 316L and SMA weldment. In H. F. Abdul Amir (Ed.), Functional Materials and Metallurgy - ICFMM 2016 (pp. 120-124). (Solid State Phenomena; Vol. 263 SSP). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/SSP.263.120