The effect of Pd and Ni coatings on hydrogen permeation experiments of as-quenched martensitic steel

IF 2.7 4区 材料科学 Q3 ELECTROCHEMISTRY Corrosion Reviews Pub Date : 2023-05-15 DOI:10.1515/corrrev-2022-0118
R. Latypova, T. Nyo, O. Seppälä, Kasper Hahtonen, H. Hänninen, J. Kömi, S. Pallaspuro
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引用次数: 1

Abstract

Abstract Hydrogen permeation technique is a widely used testing method for the determination of hydrogen diffusion coefficient (D), which is an important parameter considering hydrogen embrittlement. A palladium (Pd) or nickel (Ni) coating is often utilised on the hydrogen detection side of the test specimens. Here, we investigate the effect of Pd and Ni coatings on hydrogen diffusion in a martensitic 500 HBW hardness low-alloy steel in the thickness range of 0.5 – 0.8 mm using a refined successive transient method and compare against an uncoated reference specimen. Both coatings yield similar average D values (6 – 6.6 × 10−7 cm2/s), but the best repeatability is achieved with Pd coating. With Ni coating, D values decrease with the increasing specimen thickness, which is partly caused by a slower hydrogen diffusion in Ni, and therefore a concentration gradient at the specimen-coating interface. The uncoated specimen has a poor transient fit, and significantly lower D (2.1 × 10−7 cm2/s) due to surface oxidation. With both coatings, the steepness of the last decay transient was highly affected by specimen thickness, and therefore the density of reversible hydrogen traps is only comparable for similar thicknesses.
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Pd和Ni涂层对淬火马氏体钢渗氢实验的影响
摘要氢渗透技术是测定氢扩散系数(D)的一种广泛使用的测试方法,氢扩散系数是考虑氢脆的一个重要参数。钯(Pd)或镍(Ni)涂层通常用于试样的氢检测侧。在这里,我们研究了Pd和Ni涂层对马氏体500中氢扩散的影响 HBW硬度低合金钢,厚度范围为0.5–0.8 mm,并与未涂覆的参考样品进行比较。两种涂层的平均D值相似(6–6.6×10−7 cm2/s),但是用Pd涂层实现了最佳的可重复性。对于Ni涂层,D值随着试样厚度的增加而减小,这在一定程度上是由Ni中较慢的氢扩散引起的,因此是由试样-涂层界面处的浓度梯度引起的。未涂覆试样的瞬态拟合较差,且D明显较低(2.1×10−7 cm2/s)。对于这两种涂层,最后一次衰变瞬态的陡度在很大程度上受到样品厚度的影响,因此可逆氢陷阱的密度仅在类似厚度下可比较。
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来源期刊
Corrosion Reviews
Corrosion Reviews 工程技术-材料科学:膜
CiteScore
5.20
自引率
3.10%
发文量
44
审稿时长
4.5 months
期刊介绍: Corrosion Reviews is an international bimonthly journal devoted to critical reviews and, to a lesser extent, outstanding original articles that are key to advancing the understanding and application of corrosion science and engineering in the service of society. Papers may be of a theoretical, experimental or practical nature, provided that they make a significant contribution to knowledge in the field.
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