Force of Habit

Use of SVET to evaluate corrosion resistance of heat tinted stainless steel welds and effect of post‐weld cleaning

“…Some authors have considered the existence of a chromiumdepleted zone beneath the oxide as the main cause of an observed decrease in corrosion resistance [3,4,14]. However, other authors instead reported that no such zone was found [1,2,7,8] and suggested various mechanisms explaining the presence or lack of a chromium-depleted zone.…”

“…One factor often correlated to the corrosion resistance is the colour of the tint [1,[3][4][5][6]8]. According to von Moltke et al [1], the colour of the oxide is only an indication of the thickness of the oxide, not the composition or the corrosion resistance.…”

“…Heat tints, also called weld oxides or thermal oxides, are formed on stainless steels at elevated temperatures, such as during welding or heat treatments [1][2][3][4][5][6][7][8][9]. Heat tints from welding are typically removed with different cleaning processes to restore the corrosion resistance [9].…”

“…Heat tints from welding are typically removed with different cleaning processes to restore the corrosion resistance [9]. Significant work has been devoted to investigations of the heat tints' composition, formation and influence on corrosion resistance [1][2][3][4][5]7,8,[10][11][12][13][14][15][16][17][18][19].…”

“…The properties of the tint vary regarding both thickness and composition depending on the composition of the base metal and filler material as well as the welding technique used and welding parameters such as shielding gas composition and heat input [4,7,14]. Often, heat tints consist either of a chromium oxide layer or several layers with different or mixed oxides enriched in certain elements such as iron and manganese [1][2][3]7,[10][11][12]14].…”