Corrosion mechanism of graphitized cooling-water pipes and their protection by HVOF-sprayed WC–10Co–4Cr coatings

Journal of Materials Research and Technology 2026 Open access

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Authors: Weihong Li, Li Wang, Taiping Lin, Qiang Wang, Yanlin Wang, Xiaohua Chen, Zidong Wang
DOI: 10.1016/j.jmrt.2026.03.266
Cited by: 1
References: 39

Abstract

Cooling-water pipes in graphitization lines suffer from coupled high-temperature sulfur corrosion and erosion. This study characterizes the axial corrosion gradient of uncoated 310S pipes and evaluates HVOF-sprayed WC–10Co–4Cr coatings (100, 200, 300 μm). The uncoated pipe shows severe tip corrosion (penetration ∼316–380 μm) governed by grain boundary degradation and sulfate-induced depassivation. The 200 μm coating exhibits the best mechanical integrity (bond strength 82.0 ± 3.4 MPa, hardness 1295 HV0.1), high-temperature wear resistance (8.8-fold lower wear volume), and corrosion resistance, with continuous coverage confirmed by post-service inspection.

Fields of Study & Subjects

High-Temperature Coating Behaviors Erosion and Abrasive Machining Corrosion Behavior and Inhibition

Publication details

Journal / source
Journal of Materials Research and Technology
Publisher
Elsevier BV
Volume
42
Pages
3022–3033
Publication date
30 March 2026
Language
EN