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research-article

Effect of pre-hot corrosion on erosion behavior of high chromium ferritic steel for heat exchangers

[+] Author and Article Information
Ankitendran Mishra

Department of Metallurgical Engineering, Indian Institute of Technology (B.H.U.), Varanasi, India
ankitendranm.rs.met15@iitbhu.ac.in

Dhananjay Pradhan

Department of Metallurgical Engineering, Indian Institute of Technology (B.H.U.), Varanasi, India
dhananjay.rs.met13@iitbhu.ac.in

C K Behera

Department of Metallurgical Engineering, Indian Institute of Technology (B.H.U.), Varanasi, India
ckbehera.met@itbhu.ac.in

Sunil Mohan

Department of Metallurgical Engineering, Indian Institute of Technology (B.H.U.), Varanasi, India
smohan.met@iitbhu.ac.in

Anita Mohan

Department of Physics, Indian Institute of Technology (B.H.U.), Varanasi, India
amohan.app@iitbhu.ac.in

1Corresponding author.

ASME doi:10.1115/1.4042391 History: Received October 03, 2018; Revised December 15, 2018

Abstract

This study presents the pre-hot corrosion effect on erosion behavior of AISI 446 SS in simulated heat exchanger environment at elevated temperature. Samples were spray deposited using two salt mixture (Na2SO4/NaCl). Subsequently, low-temperature hot corrosion tests were carried out at 550, 650 and 750? for 20 h. Chlorination followed by sulfidation was mainly responsible for the passive layer formation during the process of hot corrosion. The pre-hot corroded samples were subjected to air-jet erosion test using alumina as the erodent, at impact velocity of 100 m/s and flux rate of 4.2 g/min, with variable impingement angles of 30, 60 and 90°. The passive layer formed during corrosion underwent detachment of metallic flakes through cracking during the impact of erodent, and was responsible for a significant change in erosion rate. Cutting, ploughing, lip formation, and particle embedment were identified as the operative mechanisms during erosion.

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