Abstract
Uniform corrosion occurred on CGHAZ of Q315NS owing to coarse GB while pitting occurs on BM after metastable pitting.
Highlights
Metallic components in petrochemical and power industries are seriously corroded when corrosive gases (SO3, HCl, NO2, etc.) are cooled and converted to condensed acids on the metal surface, which is de ned as dew point corrosion (DPC).[1]
The corrosion processes of base metal (BM) and the simulated heat-affected zone (HAZ) of Q315NS steel in a 0.1 mol LÀ1 HCl solution at 60 C were investigated by electrochemical noise (EN), potentiodynamic polarization, EIS and surface observation
The main conclusions are as follows: (1) The corrosion process of BM of Q315NS could be divided into two stages: the initial metastable pitting stage and the following pitting corrosion stage
Summary
Metallic components in petrochemical and power industries are seriously corroded when corrosive gases (SO3, HCl, NO2, etc.) are cooled and converted to condensed acids on the metal surface, which is de ned as dew point corrosion (DPC).[1]. Q315NS is produced by appropriate alloy design, in which Cu and Sb have a signi cant impact on improving the corrosion resistance.[2,3,4,5] Cu is capable of enhancing the activity of the cathode, which will promote the passivation of the anode under certain conditions. Thereby the corrosion rate reduces due to the passivation of the anode. The enrichment of Cu in the corrosion product is able to greatly improve the corrosion protection performance. The Cu2S in the corrosion product can simultaneously prevent the corrosion process in the case of an appropriate amount Sb being contained in the steel.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call