Change in the Structure and Corrosion Resistance of a Nickel-Chrome Coating on Stainless Steel During Implantation of Hi
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CHANGE IN THE STRUCTURE AND CORROSION RESISTANCE OF A NICKEL-CHROME COATING ON STAINLESS STEEL DURING IMPLANTATION OF HIGH ENERGY Al+ AND B+ IONS T. I. Dorofeeva, T. A. Gubaidulina, V. P. Sergeev, M. P. Kalashnikov, and A. V. Voronov
UDC 621.793:621.893:669:058:544.6
Magnetron sputtering, vacuum arc deposition, and ion implantation have been used to create a three-layer anti-corrosive coating structure on stainless steel samples. The microstructure of the coating was analyzed using scanning and transmission electron microscopy. The chemical composition and concentration profile of the coating were determined using X-ray microanalysis. The structural-phase state of the coatings was studied using X-ray diffraction and electron diffraction analysis. The roughness of the experimental samples was determined using contact profilometry. The microhardness of the substrate and coating was determined using sclerometry. The salt spray corrosion tests and analysis of polarization curve have shown a significant increase in the corrosion resistance of stainless steel after deposition of a Ni/Cr/Al+B+ protective coating. Keywords: magnetron sputtering, ion implantation, vacuum arc deposition, coating, stainless steel, microstructure, microhardness, corrosion resistance.
INTRODUCTION Details and constructions made of stainless steel, when exposed to negative environmental factors, require additional anti-corrosion protection. Most often, such protection consists in the deposition of layers of coatings based on organic and inorganic materials or metals on the surface of the protected structures by various methods. Among them are chemical [1], including sol-gel technologies [2], electrochemical (galvanic, microplasma treatment) [3–6], vacuum (ion implantation [7, 8], magnetron or vacuum arc deposition [9 –15]), and other technologies [16–22], which make it possible to form a barrier layer on the surface that prevents the spread of corrosion of the base metal. This, as a rule, protects the structure from biological, chemical, and mechanical influences. Unfortunately, the coatings obtained by the galvanic method [2, 23, 24] have significant drawbacks. Along with the fact that the processes of obtaining coatings are not environmentally friendly, since reagents hazardous to humans and the environment are used, their negative impact on the environment cannot be completely neutralized even by modern methods of air and waste water purification. Protective films obtained by these methods are often porous and loose and have low adhesion. The formation of pores in the obtained coatings requires the introduction of additional technological operations, such as filling the pores in chromates or polymer coloring, which leads to an increase in the cost and the time of the technological process of manufacturing the finished product as a whole. But even the introduction of additional costly operations does not guarantee obtaining a reliable coating for the operation of details and constructions in highly aggressive environments. One of the ways t
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