Hydrogen penetration resistance and mechanical properties of electroplated Ni–P alloys
About: This article is published in Journal of The Less Common Metals.The article was published on 1990-11-01. It has received 6 citations till now. The article focuses on the topics: Maraging steel & Electroplating.
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15 Feb 2013-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the contact fracture property and mechanism of electroplated Ni-P coating on stainless steel substrate were investigated using ball indentation testing, through a comprehensive experimental and numerical approach.
Abstract: The contact fracture property and mechanism of electroplated Ni–P coating on stainless steel substrate were investigated using ball indentation testing, through a comprehensive experimental and numerical approach First, the elastoplastic properties of both coating and substrate were evaluated using micro-indentation tests Next, ball indentation test with large contact force was performed, such that the brittle coating on ductile substrate suffers from cracks, including ring crack (propagates circumferentially) and radial cracks (propagates radially), owing to the coating bending effect The fracture nucleation process was investigated using the acoustic emission technique (AET) In addition, finite element method (FEM) with cohesive zone model (CZM) was carried out to compute stress field and simulate crack initiation around the impression during the test By using the comprehensive experimental/computational framework, the nucleation process (mechanism) of such a complicate crack system was clarified The present technique and fracture mechanism may be applicable to the analysis of structural integrity of other brittle coatings
21 citations
22 Oct 2013
TL;DR: In this article, the contact fracture property and mechanism of electroplated Ni-P coating on stainless steel substrate were investigated using ball indentation testing, through a comprehensive experimental and numerical approach.
Abstract: Abstract The contact fracture property and mechanism of electroplated Ni–P coating on stainless steel substrate were investigated using ball indentation testing, through a comprehensive experimental and numerical approach. First, the elastoplastic properties of both coating and substrate were evaluated using micro-indentation tests. Next, ball indentation test with large contact force was performed, such that the brittle coating on ductile substrate suffers from cracks, including ring crack (propagates circumferentially) and radial cracks (propagates radially), owing to the coating bending effect. The fracture nucleation process was investigated using the acoustic emission technique (AET). In addition, finite element method (FEM) with cohesive zone model (CZM) was carried out to compute stress field and simulate crack initiation around the impression during the test. By using the comprehensive experimental/computational framework, the nucleation process (mechanism) of such a complicate crack system was clarified. The present technique and fracture mechanism may be applicable to the analysis of structural integrity of other brittle coatings.
18 citations
TL;DR: In this article, the authors investigated the cyclic contact fracture mechanism of hard coatings on ductile substrates (an electroplated Ni-P coating on a stainless steel substrate, SUS304) in order to evaluate their mechanical durability.
14 citations
12 citations
TL;DR: In this article, a hard coating of electroless NiP deposited on carbon steel substrate (SKD11) was prepared, and the effect of post heat treatment on adhesion was comprehensively investigated.
Abstract: This study aims to evaluate the adhesion strength and durability of Ni P coatings in a non-contact manner using the Laser Shock Adhesion Test (LaSAT). A hard coating of electroless Ni P deposited on carbon steel substrate (SKD11) was prepared, and the effect of post heat treatment on adhesion was comprehensively investigated in this study. With the LaSAT, strong elastic waves induced by pulsed YAG laser irradiation applies tensile stress to the coating/substrate interface resulted in interfacial delamination. Computation of the elastic-wave propagation using finite element method (FEM) was carried out to estimate the interfacial tensile stress. In addition, the adhesion durability was investigated by repetitive pulsed-laser irradiation, and the relationship between adhesion strength and the number of laser irradiation cycles until delamination was obtained. Finally, the effects of heat treatment on the adhesion strength and durability of the Ni P coating were discussed. Owing to the post-heat treatment, it is found that the hardness of coating, adhesion strength and durability were improved. Indentation test reveals that the coating hardness increases from 792 HV to 1163 HV. LaSAT quantitatively evaluated the adhesion strength with increasing from 84.4 MPa to 143.9 MPa. In addition, repetitive LaSAT reveals that adhesion durability improves twice or more. This result was verified using the tensile adhesion test and microscopic observations of the interface. Therefore, the present LaSAT is a quick measurement for the adhesion durability of hard coating, and it may shed some light on quality control of surface coatings.
11 citations
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TL;DR: The structure of noncrystalline electrodeposited Ni-P alloys, 73.8-81.4 at.% Ni, has been investigated by x-ray scattering and by physical density measurements as discussed by the authors.
Abstract: The structure of noncrystalline electrodeposited Ni–P alloys, 73.8–81.4 at.% Ni, has been investigated by x‐ray scattering and by physical density measurements. The x‐ray interference functions, I(k), are qualitatively inconsistent with those calculated for fcc‐, hcp‐, and Ni3P‐type crystallites. Calculated radial distribution functions RDF(r) indicate that the alloys have a better defined short‐range order than that observed in liquid noble metals above their melting points. The observed I(k) are very similar to the I(k) calculated by Dixmier, Doi, and Guinier [in Physics of Noncrystalline Solids, J. A. Prins, Ed. (North‐Holland Publ. Co., Amsterdam, 1965), p. 67] from their model. However, the parameters needed to fit the experimental results are inconsistent with the atomic sizes expected for nickel and phosphorus. The noncrystalline alloys are between 0.6% and 1.4% less dense than the corresponding mixtures of fcc Ni and Ni3P, both of which are essentially close packed. A grain boundary density defici...
273 citations
TL;DR: Alloys containing nickel or cobalt and as many as 15 perceni of phosphorus have been electrodeposited in solutions containing phosphites as mentioned in this paper, but these alloys are hard and may be further hardened by heat-treating at 4000 C.
Abstract: Alloys containing nickel or cobalt and as mu ch as 15 perceni of phosphorus have been electrodeposited fl'om solutions containing phosphites. The alloys are hard a nd may be further harde ned by heat-treating at 4000 C. The high-phosphorus ni ckel alloy is more resistant to attack by hydrochloric acid than pure nickel deposits . The high-phosphorus alloys a re b ri ght as deposited , but t heir reflectivities a re lower than those of buffed coatings of pure nickel. .
202 citations