Si-Al-N-O Multi-Layer Coatings with Increased Corrosion Resistance Deposited on Stainless Steel by Magnetron Sputtering

Tatiana Gubaidulina,Marina Fedorischeva,Tamara Dorofeeva,Victor Sergeev

doi:10.3390/met12020254

Tatiana Gubaidulina, Marina Fedorischeva + Show 2 more

Open Access

https://doi.org/10.3390/met12020254

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Journal: Metals	Publication Date: Jan 28, 2022
Citations: 5	License type: CC BY 4.0

Affiliation: Institute of Strength Physics and Materials Science

Abstract

This work studies single-layer (Al-Si-N) and multi-layer (Al-Si-N-O/Al-Si-O) coatings deposited by magnetron sputtering on stainless steel specimens (AISI 321), which can be used under aggressive conditions. The multi-layer coating consists of six alternating layers of Al-Si-N-O and Al-Si-O with a thickness of 0.9 µm and 0.2 µm, respectively. The structural-phase state and the chemical composition of the coatings were studied by transmission and scanning electron microscopy and XPS analysis. It was revealed that single-layer coatings are nanocrystalline and contain AlN and α-Si3N4 phases. Multi-layer coatings (Al-Si-N-O/Al-Si-O) are amorphous in each of the layers. The corrosion properties of substrate and coated specimens were investigated using a potentiostat in the 3.5 mg/l sea salt solution. It was found that corrosion resistance of stainless steel specimens with multi-layer coating is substantially (tenfold) higher compared with substrates and the specimens with single-layer coating.

Highlights

Metal construction and manufactured parts experience complex external loads during their operation, as they suffer from atmospheric factors, aggressive substances and temperature fluctuation-induced loads
Stainless steels are widely used as a construction material due to their corrosion resistance under a wide range of operation conditions
The problem of increased corrosion resistance of stainless steels can be solved by alloying steel [5,6,7,8,9] or using corrosion-resistant coatings

Summary

Introduction

Metal construction and manufactured parts experience complex external loads during their operation, as they suffer from atmospheric factors, aggressive substances and temperature fluctuation-induced loads. Anti-corrosion coatings provide maximum life of metal materials (along with such physicomechanical properties as wear resistance, adhesion, hardness, thermal stability) and widen their application range [10,11,12,13,14,15,16].

Results

Conclusion