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341146

Influence of Heat Treatment on Crystal Structure, Microhardness and Corrosion Resistance of Hybrid Electroless Ni‑P‑Al2O3-Mo2C Coating on 90wt% Al-10wt% Mg alloy

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Last updated: 01 Jan 2025

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Abstract

The aim of this study was to investigate the properties of an electroless Ni-P-Al2O3-Mo2C coating on a 90wt% Al-10wt% Mg alloy. A thermal process was conducted at 400 °C for 1 hour to assess the impact of temperature on the coating properties. The structure of the bilayer coatings was analyzed using X-ray diffraction (XRD), and the surface topography of the hybrid coating was observed using a scanning electron microscope. It was found that at a concentration of 2 g/L, the Al2O3 and Mo2C distributions in the Ni-P coating bath exhibited a more uniform nodular or columnar structure. The hardness of the deposit was measured using a Vickers hardness tester, and the Ni-P-Al2O3-Mo2C coating sintered with a nanoparticle concentration of 2 g/L showed the highest hardness value of 692 VHN. This value was 19.32% higher than the unsintered Ni-P-Al2O3-Mo2C external layered coating. Furthermore, potentiodynamic polarization studies were performed in a 3.5% NaCl solution to evaluate the corrosion behavior of the hybrid coating under ambient conditions. The results indicated that the Ni-P-Al2O3-Mo2C coating formed at 2 g/L provided the highest corrosion protection, as confirmed by the highest positive Ecorr value of -0.2.4 V, attributed to the maximum particle deposition rate. Overall, the combination of NiP3, Al2O3, and Mo2C phases in the coating exhibited synergistic effects, leading to improved anti-corrosion and mechanical properties.

DOI

10.21608/ejchem.2024.257049.9014

Keywords

Electroless Ni-P coating, Heat treatment, Microhardness, Corrosion Resistance, Hybrid coatings

Authors

First Name

Shetha

Last Name

Daniel

MiddleName

-

Affiliation

Department of Mechanical Engineering, National Institute of Technology, Durgapur, India

Email

shethamanu80@gmail.com

City

-

Orcid

-

First Name

Nilotpal

Last Name

Banerjee

MiddleName

-

Affiliation

Department of Mechanical Engineering, National Institute of Technology, Durgapur 713209, India

Email

nil_rec@yahoo.com

City

Durgapur

Orcid

-

First Name

Manik

Last Name

Majumder

MiddleName

-

Affiliation

Department of Mechanical Engineering, National Institute of Technology, Durgapur 713209, India

Email

manik_rec@yahoo.com

City

Durgapur

Orcid

-

First Name

Sudhir

Last Name

C. V.

MiddleName

-

Affiliation

Department of Mechanical & Industrial Engineering, College of Engineering, National University of Science & Technology, P.O.Box : 2322, CPO Seeb 111, Al Hail, Sultanate of Oman

Email

sudhircv@nu.edu.om

City

-

Orcid

-

Volume

67

Article Issue

9

Related Issue

48208

Issue Date

2024-09-01

Receive Date

2023-12-22

Publish Date

2024-09-01

Page Start

269

Page End

276

Print ISSN

0449-2285

Online ISSN

2357-0245

Link

https://ejchem.journals.ekb.eg/article_341146.html

Detail API

https://ejchem.journals.ekb.eg/service?article_code=341146

Order

341,146

Type

Original Article

Type Code

297

Publication Type

Journal

Publication Title

Egyptian Journal of Chemistry

Publication Link

https://ejchem.journals.ekb.eg/

MainTitle

Influence of Heat Treatment on Crystal Structure, Microhardness and Corrosion Resistance of Hybrid Electroless Ni‑P‑Al2O3-Mo2C Coating on 90wt% Al-10wt% Mg alloy

Details

Type

Article

Created At

30 Dec 2024