Barrier ability and durability of Ni Co P coatings in accordance to the content of H3PO3 and NaH2PO2 as phosphorus sources

Ignatova, K.; Kozhukharov, S.; Alakushev, M.

doi:10.1016/j.matchemphys.2018.08.025

Cited by 10 publications

(2 citation statements)

References 26 publications

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“…Chrome plating has been highly favored for its advantages (e.g., high hardness, excellent corrosion resistance, and wear resistance), whereas the environmental pollution and health hazards arising from hexavalent chromium in the plating solution have aroused rising attention. , Electroplated Ni–Co–P alloy coatings have been considered a promising alternative to chrome plating for their prominent thermal stability, corrosion resistance, and wear resistance, as reported in existing research. − However, several problems (e.g., severe hydrogen evolution at the cathode and unstable plating solution) during the electroplating process of Ni–W–B alloy coatings can trigger cracked coatings, lack of metallic luster, and inadequate decorative properties. , Accordingly, the electroplating process of the Ni–W–B alloy should be investigated in depth.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effects of Additives on the Performance of Ni–Co–P Alloy Coatings Using Box–Behnken Design

Shen,

Ding,

Sun

et al. 2023

ACS Omega

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To understand the effects of additives on the performance of a Ni− Co−P alloy electroplated coating, this study, based on a single-factor experiment, utilized a Box−Behnken experimental design to optimize an additive that can enhance the electrodeposited Ni−Co−P alloy coating's properties, including hardness, glossiness, and corrosion resistance. The study used tools such as a gloss meter, a Vickers hardness tester, and an electrochemical workstation to analyze the impact of different additives on the coating's hardness and gloss. The optimal additive combination was determined. The results from the Box−Behnken experiment showed that when the concentrations of sodium dodecyl sulfate, thiourea, and sodium allyl sulfonate reached 0.10, 0.15, and 0.22 g/L, respectively, the resulting coating hardness was 475.4 HV 0.5 , and the gloss level was 463.4 GU. Compared to the coatings without additives, the hardness increased by 90.34 HV 0.5 , and the glossiness rose by 101.2 GU. The coating's corrosion resistance also improved. This enhancement is attributed to the compounded additive, which significantly improved the surface morphology of the coating, making it smoother and more compact. The morphology and composition of the coatings with additives were analyzed through scanning electron microscopy and energy dispersive X-ray spectroscopy, and the composition of the coating contains 71.01 at % Ni, 20.65 at % Co, and 8.34 at % P. At the same time, the optimized coating exhibits a metallic luster similar to stainless steel, meeting industrial requirements.

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Section: Introductionmentioning

confidence: 99%

Study on the Effects of Additives on the Performance of Ni–Co–P Alloy Coatings Using Box–Behnken Design

Shen,

Ding,

Sun

et al. 2023

ACS Omega

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“…In this sense, the most widely used model corrosive media are NaCl solutions [64][65][66]. Particularly, the 3.5% NaCl solutions are the most preferred, since they resemble sea water [67][68][69].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Anodized Al 1050 with Electrochemically Deposited Cu, Ni and Cu/Ni and Their Behavior in a Model Corrosive Medium

Girginov

Kozhukharov

Tsanev

et al. 2021

J. Electrochem. Sci. Technol

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The specific benefits of the modified films formed on preliminary anodized aluminum, including the versatility of their potential applications impose the need for evaluation of the exploitation reliability of these films. In this aspect, the durability of Cu and Ni modified anodized aluminum oxide (AAO) films on the low-doped AA1050 alloy was assessed through extended exposure to a 3.5% NaCl model corrosive medium. The electrochemical measurements by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic scanning (PDS) after 24 and 720 hours of exposure have revealed that the obtained films do not change their obvious barrier properties. In addition, supplemental analyses of the coatings were performed, in order to elucidate the impact of the AC-deposition of Cu and Ni inside the pores. The scanning electron microscopy (SEM) images have shown that the surface topology is not affected and resembles the typical surface of an etched metal. The subsequent energy dispersive X-ray spectroscopy (EDX) tests have revealed a predominance of Cu in the combined AAO-Cu/Ni layers, whereas additional X-ray photoelectron (XPS) analyses showed that both metals form oxides with different oxidation states due to alterations in the deposition conditions, promoted by the application of AC-polarization of the samples.

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Ni‐Co‐W Alloys

Costa

Portela

Neto

2020

Alloy Materials and Their Allied Applications

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Barrier ability and durability of Ni Co P coatings in accordance to the content of H3PO3 and NaH2PO2 as phosphorus sources

Cited by 10 publications

References 26 publications

Study on the Effects of Additives on the Performance of Ni–Co–P Alloy Coatings Using Box–Behnken Design

Study on the Effects of Additives on the Performance of Ni–Co–P Alloy Coatings Using Box–Behnken Design

Characterization of Anodized Al 1050 with Electrochemically Deposited Cu, Ni and Cu/Ni and Their Behavior in a Model Corrosive Medium

Ni‐Co‐W Alloys

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