Corrosion behaviour of cobalt-based coatings with ruthenium additions in synthetic mine water

Results in Materials Pub Date : 2024-02-20 DOI:10.1016/j.rinma.2024.100546

Silas I. Hango , Lesley A. Cornish , Josias W. van der Merwe , Lesley H. Chown , Frank P.L. Kavishe

引用次数: 0

Abstract

The corrosion behaviour of two cobalt-based coatings (ULTIMET™ and STELLITE™ 6) with zero, 0.3 and 0.6 wt% ruthenium were studied and compared with two cobalt-based bulk alloys (ULTIMET™ and STELLITE™ 6B) in synthetic mine water (pH values of 6, 3 and 1) using potentiodynamic polarisation. The coatings demonstrated wider ranges of passivation behaviour (from −250 mV to 750 mV) than the bulk alloys. The corrosion potential became more positive and the active-passive transition reduced with increased Ru. The best coating was STELLITE™ 6 with 0.6 wt% Ru, which exhibited the lowest corrosion rates: 3.6 μm/y at pH 6 and 6.4 μm/y at pH 3.

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添加钌的钴基涂层在合成矿井水中的腐蚀行为

使用电位极化法研究了两种钌含量分别为零、0.3 和 0.6 wt%的钴基镀层（ULTIMET™ 和 STELLITE™ 6）的腐蚀行为，并将其与两种钴基块状合金（ULTIMET™ 和 STELLITE™ 6B）在合成矿井水中（pH 值分别为 6、3 和 1）的腐蚀行为进行了比较。与块状合金相比，涂层的钝化范围更广（从 -250 mV 到 750 mV）。随着 Ru 的增加，腐蚀电位变正，活性-钝化转变减小。最佳涂层是含 0.6 wt% Ru 的 STELLITE™ 6，其腐蚀率最低：pH 值为 6 时为 3.6 μm/y，pH 值为 3 时为 6.4 μm/y。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Results in Materials

CiteScore

5.30

自引率

0.00%

发文量