https://orcid.org/0000-0003-1046-4610
Corrosion resistance properties of Ti/TiN and TiAl/TiAlN nanolayered multilayered coatings deposited on Ti6Al4V alloy substrates by unbalanced magnetron sputtering were investigated. The coatings contain a bi-layer thickness of Ti/TiN or TiAl/TiAlN ∼3.5 nm/4 nm and the total thickness of the coating is ∼9 µm. Corrosion properties of the coatings were investigated using electrochemical impedance spectroscopy (EIS) for 30 d while immersed in 3.5 wt% NaCl solution. EIS investigation of the coatings showed that the corrosion occurred due to the penetration of electrolyte and oxygen through the micro/nanopores present in the coatings. It was found that the TiAl/TiAlN coating offered corrosion protection superior to that of the Ti/TiN coating during the immersion study. Potentiodynamic polarization studies revealed that both coatings showed passive behavior. Formation of a passive film on the coated surface during polarization enhanced the barrier properties of the coatings and provided anodic protection to the underlying alloy.
Skip Nav Destination
Article navigation
1 February 2023
Research Article|
December 05 2022
Comprehensive Electrochemical Studies on Nanolayered Multilayered Ti/TiN and TiAl/TiAlN Coatings Deposited on Ti6Al4V Substrates
Arunchandran Chenan
Arunchandran Chenan
*Smart Coating Research Laboratory, Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute, Karaikudi, 630 003, India.
***Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India.
Search for other works by this author on:
J. Jyothymol
J. Jyothymol
*Smart Coating Research Laboratory, Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute, Karaikudi, 630 003, India.
***Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India.
Search for other works by this author on:
Venkataramana Bonu
Venkataramana Bonu
**Nanomaterials Research Laboratory, Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore, 560 017, India.
Search for other works by this author on:
Harish C. Barshilia
Harish C. Barshilia
‡
**Nanomaterials Research Laboratory, Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore, 560 017, India.
Search for other works by this author on:
CORROSION (2023) 79 (2): 134–145.
