Corrosion studies on post-weld heat treated dissimilar AISI 2205 and AISI 310 joints using electrochemical noise analysis

Govindasamy, Mahadevan (author), Mangalakaran, Lloyd Jenner Joseph Manuel (author), Thamilkolunthu, Senthilkumar (author)

The corrosion behavior of dissimilar weldments between AISI310 and AISI2205 stainless steels in a 5 % calcium chloride solution at 50 °C was investigated under three conditions: as-welded, lower post-weld heat treatment at 800 °C, and higher post-weld heat treatment at 1000 °C. Microstructural examination revealed severe pitting in the as-welded sample, with pit widths ranging from 270 μm to 360 μm. The lower heat-treated sample had larger pits (310 μm to 370 μm), while the higher heat-treated sample showed homogeneous corrosion with a protective oxide coating. The as-welded sample had the highest corrosion rate, followed by the lower heat-treated sample, which had a moderate rate, and the higher heat-treated sample had the lowest rate. The corrosion current densities were 5,26 × ▫$10^{-3}$▫ mA/cm², 4,6 × ▫$10^{-4}$▫ mA/cm² and 1,4 × ▫$10^{-4}$▫ mA/cm², respectively. Electrochemical noise measurements confirmed these findings, with the higher heat-treated sample showing negligible localized corrosion and homogenous corrosion behavior.

• Language: English
• Keywords: AISI2205, corrosion, electrochemical impedance spectroscopy, Ca▫$Cl_2$▫
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Publication date: 01.01.2025
• Year: 2025
• Number of pages: Str. 3-9
• Numbering: Vol. 71, no. 1/2
• PID: 20.500.12556/RUL-167617
• UDC: 621
• ISSN on article: 2536-3948
• DOI: 10.5545/sv-jme.2024.1084
• COBISS.SI-ID: 227927811
• Publication date in RUL: 04.03.2025

Record is a part of a journal

• Title: Strojniški vestnik
• Shortened title: Stroj. vestn.
• Publisher: Fakulteta za strojništvo
• ISSN: 2536-3948
• COBISS.SI-ID: 294943232

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian

Abstract

Korozijsko obnašanje neenakih zvarov nerjavnih jekel AISI310 in AISI2205v 5-odstotni raztopini kalcijevega klorida pri 50 °C je bilo raziskano pod tremi pogoji: kot varjeno, z nižjo toplotno obdelavo po varjenju pri 800 °C in z višjo toplotno obdelavo po varjenju pri 1000 °C. Mikrostrukturna analiza je pokazala izrazito jamasto korozijopri varjenem vzorcu, pri čemer so bile širine jamic med 270 μm in 360 μm. Vzorec z nižjo toplotno obdelavo je imel večje vdolbine (310 μm do 370 μm), medtem ko je pri vzorcu, ki je bil toplotno obdelan višje, opaziti homogeno korozijo z zaščitno oksidno prevleko. Najvišjo stopnjo korozije je imel varjeni vzorec, sledil mu je nizko- toplotno obdelani vzorec z zmerno stopnjo, najnižjo stopnjo korozije pa je imel visoko-toplotno obdelani vzorec. Gostote korozijskega toka so bile 5,26 × ▫$10^{-3}$▫ mA/cm², 4,6 × ▫$10^{-4}$▫ mA/cm² oziroma 1,4 × ▫$10^{-4}$▫ mA/cm². Elektrokemične meritve šuma so potrdile te ugotovitve, pri čemer je vzorec, ki je bil obdelan z višjo toplotno obdelavo, pokazal zanemarljivo lokalizirano korozijo in homogeno korozijsko obnašanje.