Effects of Mn and Cu on descaling of hot-rolled 304L stainless steel in HCl and H<sub>2</sub>O<sub>2</sub> mixtures-Reference-Cited by-同舟云学术

Effects of Mn and Cu on descaling of hot-rolled 304L stainless steel in HCl and H₂O₂ mixtures

Published:2023-06-23 Issue:8 Volume:65 Page:1167-1178
ISSN:0025-5300
Container-title:Materials Testing
language:en
Short-container-title:

Author:

Lothongkum Anchaleeporn Waritswat¹,Benjamalai Boonyapa¹,Hongbin Nichit¹,Prawetpai Nipa²,Tiyawatwitthaya Chockanan³,Wanichpongpan Piyabutr⁴,Lothongkum Gobboon⁵

Affiliation:

1. Department of Chemical Engineering, School of Engineering , King Mongkut’s Institute of Technology Ladkrabang , Bangkok , Thailand

2. POSCO – Thainox Public Company Limited , Rayong , Thailand

3. Visavakit Patana Corp., Ltd. , Pathumthani , Thailand

4. Department of Chemical Engineering, Faculty of Engineering , King Mongkut's University of Technology Thonburi , Bangkok , Thailand

5. Department of Metallurgical Engineering, Faculty of Engineering , Chulalongkorn University , Bangkok , Thailand

Abstract

Abstract Descaling of stainless-steel black coil is an important step to produce white coil with smooth glossy surface. The AISI 304L black and white coils from a company containing 1.08–1.71Mn and 0.22–0.40Cu (wt%) were used to study the effects of Mn and Cu on descaling rate by potentiodynamic polarization technique at 25 °C. The pickling solutions were 0.5 M HCl and 0.5 M HCl mixed with H2O2 of 0.5, 0.88 and 1.76 M. The polarization curves of black and white coil samples measured in HCl–H2O2 mixture showed no passive range. The descaling rate of black coil oxide scales, and the corrosion potential (E corr) increased with H2O2 concentration. Low-Mn sample, that is 1.08%Mn0.23%Cu sample, showed higher descaling rate than high-Mn samples. No effects of Cu content on the descaling rate were observed. For white coil samples, the descaling rates were almost constant, but pitting on surface was observed. Passive films were eliminated. The corrosion potentials of black and white coil samples increased when adding H2O2 in HCl solution indicating an increase in cathodic reaction due to increase in dissolved oxygen. The corrosion potentials of 1.08%Mn0.23%Cu black and white coil samples were lower than those of high-Mn samples corresponding to less Mn oxide.

Publisher

Walter de Gruyter GmbH

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Link

https://www.degruyter.com/document/doi/10.1515/mt-2023-0072/pdf

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