Title : ( Post-weld heat treatment influence on galvanic corrosion of GTAW of 17-4PH stainless steel in 3/5%NaCl )
Authors: Mohammadreza Tavakoli Shoushtari , Mohammad Hadi Moayed , Ali Davoodi ,
Full TextAbstract
The influence of post-weld heat treatment (PWHT), solution annealing followed by aging at 480, 550 and 620uC on the galvanic corrosion in 17-4PH stainless steel weldment in 3?5%NaCl was studied. Potentiodynamic polarisation revealed that all PWHTs improve the passivity of weld region by increasing the pitting potential. Heat affected zone disappears, and base and weld regions act as the anode and the cathode respectively. Zero resistance ammetry measurement for 42 h showed that PWHTs improve the galvanic corrosion resistance by decreasing the galvanic current density to a few to tenths of nanoampere per square centimetre. Aging at 620uC has the highest risk of galvanic corrosion among the three PWHTs. Difference in corrosion characteristic of base and weld were addressed to microstructure variations including ferrite, copper rich precipitates and reverted austenite.
Keywords
, 17-4PH stainless steel, PWHT, Galvanic corrosion, Potentiodynamic polarisation, ZRA measurement
@article{paperid:1018671,
author = {Tavakoli Shoushtari, Mohammadreza and Moayed, Mohammad Hadi and Davoodi, Ali},
title = {Post-weld heat treatment influence on galvanic corrosion of GTAW of 17-4PH stainless steel in 3/5%NaCl},
journal = {Corrosion Engineering, Science and Technology},
year = {2011},
volume = {46},
number = {4},
month = {March},
issn = {1478-422X},
pages = {415--424},
numpages = {9},
keywords = {17-4PH stainless steel; PWHT; Galvanic corrosion; Potentiodynamic polarisation; ZRA measurement},
}
%0 Journal Article
%T Post-weld heat treatment influence on galvanic corrosion of GTAW of 17-4PH stainless steel in 3/5%NaCl
%A Tavakoli Shoushtari, Mohammadreza
%A Moayed, Mohammad Hadi
%A Davoodi, Ali
%J Corrosion Engineering, Science and Technology
%@ 1478-422X
%D 2011
