1897 KB0 KB199920252025Govindasamy, MahadevanMangalakaran, Lloyd Jenner Joseph ManuelThamilkolunthu, Senthilkumarštevilka:1/2letnik:71str. 3-9DOI:10.5545/sv-jme.2024.1084COBISSID_HOST:227927811ISSN:2536-3948URN:URN:NBN:SI:doc-94NX8GUNenFakulteta za strojništvoStrojniški vestnikAISI2205Ca?$Cl_2$?corrosionelectrochemical impedance spectroscopyCorrosion studies on post-weld heat treated dissimilar AISI 2205 and AISI 310 joints using electrochemical noise analysis|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 behaviorKorozijsko 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 obnašanjeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo