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

Abstract

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.

Keywords

AISI2205;corrosion;electrochemical impedance spectroscopy;Ca▫$Cl_2$▫;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 621
COBISS: 227927811 Link will open in a new window
ISSN: 2536-3948
Views: 22
Downloads: 0
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Other data

Secondary language: Slovenian
Secondary 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.
Pages: str. 3-9
Volume: ǂVol. ǂ71
Issue: ǂno. ǂ1/2
Chronology: 2025
DOI: 10.5545/sv-jme.2024.1084
ID: 26010936