Study on numerical calculation method of corrosion mechanism for Co-12 laser cladding layer

IF 2.3 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Anti-corrosion Methods and Materials Pub Date : 2024-02-06 DOI:10.1108/acmm-03-2023-2766

Shuangjiu Deng, Chang Li, Xing Han, Menghui Yu, Han Sun

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Abstract

Purpose

The restoration and strengthening of QT600 is an industry bottleneck challenge. The Co-12 cladding layer has great wear and corrosion resistance. The purpose of this paper is to quantitatively reveal the transient evolution law of the corrosion process of Co-12 cladding layer on QT600 surface.

Design/methodology/approach

In this paper, a three-dimensional numerical model of the corrosion process of Co-12 cladding layer by QT600 laser cladding is established. The interaction between pitting pits and corrosion medium is considered to reveal the transient evolution of ion concentration, electrode potential, pH and corrosion rate at different locations.

Findings

The calculation shows that the ion concentration in pitting pit changes Cl⁻>Co²⁺>Na⁺, pH value decreases from top to bottom and corrosion rate at bottom is greater than that at top. The electrochemical corrosion test of Co-12 cladding layer was carried out. It is shown that the current density of QT600 increases by an order of magnitude compared to the Co-12 cladding layer, and the corrosion rate is 4.862 times higher than that of the cladding layer.

Originality/value

The results show that Co-12 cladding layer has great corrosion resistance, which provides an effective way for QT600 protection.

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Co-12 激光熔覆层腐蚀机理数值计算方法研究

目的 QT600 的修复和加固是一个行业瓶颈难题。Co-12 堆焊层具有很好的耐磨性和耐腐蚀性。本文旨在定量揭示 QT600 表面 Co-12 堆焊层腐蚀过程的瞬态演变规律。计算结果表明，点蚀坑中的离子浓度变化为 Cl->Co2+>Na+，pH 值从上到下逐渐降低，底部的腐蚀速率大于顶部。对 Co-12 包层进行了电化学腐蚀试验。结果表明，与 Co-12 包覆层相比，QT600 的电流密度增加了一个数量级，腐蚀速率是包覆层的 4.862 倍。

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来源期刊

Anti-corrosion Methods and Materials 工程技术-冶金工程

CiteScore

2.80

自引率

16.70%

发文量

审稿时长

13.5 months

期刊介绍： Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.