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Microstructure characterization of localized corrosion wear of Cr/Cr2N+ a-C:H/a-C:H:Cr multilayer coatings on carbon fiber composites

Janusz M., Major L., Lackner J. M., Grysakowski B., Krawiec H.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2017

Vol. 65, nr 2

171--177

The use of carbon fiber composites (CFC) for different applications is widespread. Carbon-based materials show, however, significant oxidative degradation in air. Modern materials are subjected to aggressive, corrosive environment. This type of environment may strongly reduce their mechanical properties. For the protection of CFC, it was necessary to apply coatings to the composite surface. In the presented paper, a chromium/chromium nitride (Cr/Cr2N) multilayer structure has been selected as the inner part. The outer part of the coating was a hydrogenated amorphous carbon (a-C:H), gradually implanted by Cr nanocrystals. The application of transmission electron microscopy (TEM) indicated that the proposed deposition method allowed the formation of a Cr/Cr2N multilayer of Λ = 150 nm, topped with a-C:H+ Cr23C6 composite of a varied carbides density. The micro-hardness of the deposited coatings was up to 14 GPa (at a load of 2 and 5 mN). The microstructure of the deposited coatings was described in detail by means of TEM in the authors’ recently published paper [1]. This paper is a continuation thereof, aimed at describing microstructure changes after a localized corrosion process. In order to study localized corrosion in coatings, particularly in metallic (Cr) interlayers, the potential measurements and voltammetry experiments were performed in a Ringer solution. The open-circuit potential reaches stable values after a sufficient time period. The results indicated that the presence of a-C:H+Cr23C6, the outer part of the coating, speeds up the localized corrosion process in Cr interlayers in the inner part of a coating.

Corrosion behaviour of aluminium alloys and 316L stainless steel in propylene glycol and ethylene glycol water solution

Grysakowski B., Krawiec H.

Ochrona przed Korozją

2016

nr 7

252--255

The corrosion behaviour of two aluminium alloys (AA1050 and AA5052) and 316L stainless steel was studied in 30% ethylene glycol and propylene glycol water-based solution. The sample made of 316L stainless steel exhibits the highest corrosion resistance in all testing solutions. It was shown that investigated aluminium alloys show comparable electrochemical behaviour in both water-glycol solutions. In the case of ethylene glycol testing solution higher values of the cathodic and anodic current densities were found for all investigated samples. Therefore, the solution of ethylene glycol is a more corrosive environment compared to the propylene glycol solution.

Korozyjne zachowanie się stopów aluminium AA1050 i AA5052, a także austenitycznej stali 316L było badane w 30% roztworach wodnych glikolu etylenowego i glikolu propylenowego. Najwyższą odporność na korozję w tych środowiskach wykazuje stal 316L. Stopy aluminium wykazują podobne elektrochemiczne zachowanie w obu roztworach glikolowych. W roztworze glikolu etylenowego zarówno w obszarze katodowym jak i anodowym obserwuje się wyższe prądy dla badanych stopów. W związku z tym, roztwór glikolu etylenowego jest bardziej agresywnym pod względem korozyjnym niż roztwór glikolu propylenowego.