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Published in: Journal of Materials Science 10/2022

04-03-2022 | Metals & corrosion

Effects of pearlite on corrosion initiation and propagation in weathering steels in marine environments

Authors: Zhihui Wang, Xian Zhang, Hongwei Yu, Jing Liu, Lin Cheng, Shu-E. Hu, Kaiming Wu

Published in: Journal of Materials Science | Issue 10/2022

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Abstract

The effects of pearlite on the initiation and propagation of localized corrosion in Q370qD and Q370qE weathering steels under a simulated marine environment were examined by scanning Kelvin probe force microscopy, scanning electron microscope, scanning vibrating electrode technique and X-ray diffraction. Pearlite was uniformly distributed in Q370qD steel, whereas it displayed a banded distribution with a relatively higher proportion in Q370qE steel. Proeutectoid ferrite around pearlite and lamellar ferrite inside pearlite preferentially dissolved as the anode of micro-galvanic couples, and lamellar cementite acted as the cathode. The coarser interlamellar spacing and higher pearlite content enhanced the micro-galvanic effects in the microstructure and promoted localized corrosion propagation rate. The corrosion rate of Q370qE steel was higher than that of Q370qD steel. With the extension of corrosion time, corrosion products preferentially accumulated on the pearlite phase. The banded pearlite microstructure caused surface defects in rust layers. Uniformly distributed pearlite microstructure was more conducive to the formation of a dense rust layer.

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Metadata
Title
Effects of pearlite on corrosion initiation and propagation in weathering steels in marine environments
Authors
Zhihui Wang
Xian Zhang
Hongwei Yu
Jing Liu
Lin Cheng
Shu-E. Hu
Kaiming Wu
Publication date
04-03-2022
Publisher
Springer US
Published in
Journal of Materials Science / Issue 10/2022
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-022-07001-5

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