TY - JOUR JF - JWSTI JO - JWSTI VL - 2 IS - 2 PY - 2016 Y1 - 2016/11/01 TI - Investigation on the corrosion behaviour of 420 welding martensitic steel with the ER308L, ER309L and ER420 fillers studied in 3.5% NaCl solution with and without CO2 TT - بررسی رفتار خوردگی جوش فولاد مارتنزیتی 420 با استفاده از فلز پرکننده های L 308 ER ، L 309 ER ، 420 ER در محیط 5/3% کلرید سدیم در حضور و عدم حضور گاز دی اکسید کربن N2 - In this research 420 martensitic stainless steel welded with the ER308L, ER309L and ER420 fillers by GTAW method. The corrosion properties of the samples has been studied in 3.5% NaCl solution with and without CO2. Potentiodynamic polarization used to obtain the ER308L and ER309L have the best corrosion properties. In addition the welding process makes the 420 HAZ zone to be sensitized. The pitting potential of the samples has been decreased in presence of carbon dioxide. Furthermore, by adding CO2 to the solution the pH has been decreased and the corrosion potential reached near the -500 mV/SCE and the passivity current is also lowered. SP - 84 EP - 91 AU - Lashkari Ghoochani, Mahdi AU - Beidokhti, Behrooz AD - KW - Corrosion KW - Welding KW - Stainless steel KW - Martensit KW - Potentiodynamic polarization UR - http://jwsti.iut.ac.ir/article-1-100-en.html ER -