An attempt has been made to develop an eco-friendly trivalent black hard chromium process as an alternate to hexavalent chrome plating for industrial steel components. Vicker's hardness and A.C impedance studies revealed that the coatings exhibit high hardness and good corrosion than mild steel in sea water medium. XRD and SEM results confirmed precipitation of chromium on iron matrix which improved the mechanical properties on the heat treated mild steel surface coated by trivalent chromium. The optical properties of black coatings obtained by trivalent chromium and Ni-Cu-Co based electro plating baths were evaluated. © 2017 Elsevier Ltd.

Jeeva P-A

Department of Design and Automation

School of Mechanical Engineering

Vellore Campus

Raja K

Department of Manufacturing Engineering

Karthikeyan S

Department of Chemistry

School of Advanced Sciences

Arun K

Aravindh K.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Materials Today: Proceedings

A new trivalent chromium black plating based on trivalent chromium and cobalt metal has been optimized both in the as plated as well as annealed conditions. The annealed coatings exhibited high hardness, good corrosion resistance and optical properties. XRD and SEM investigations confirmed the formation of intermetallic phases of Cr-Co-P which induced mechanical properties of the coatings. The corrosion resistance characteristics of coatings have been evaluated in 3.5% NaCl using potentiodynamic polarization and A.C impedance measurements. The black coatings offered a good absorption and emission properties.

Fulltext

Procedia Engineering

Performance Characteristics of Corrosion Resistant Black Coatings

Nanomaterials and Surface Engineering

Decorative PVD Coatings

Surface and Coatings Technology

Electrodeposition of black chromium from environmentally electrolyte based on trivalent chromium salt

Development of dark Ti(C,O,N) coatings prepared by reactive sputtering

Renewable Energy

Design of chemical composition and optimum working conditions for trivalent black chromium electroplating bath used for solar thermal collectors

An Eco- Friendly Process On The Improvement Of Hardness And Corrosion Resistance Characteristics Of Trivalent Hard Chromium Electrodeposition

Journal	Data powered by TypesetMaterials Today: Proceedings
Publisher	Data powered by TypesetElsevier BV
ISSN	2214-7853
Open Access	No