Corrosion Resistance of Plasma Nitrided Structural Steels and Modern Methods of Testing

Abstract

The corrosion of metals is at first a technical and technological problem of duty and economical point of view. The corrosion degradation is in principle a weight-shortage of metals, which can cause a construction damage by one or several uncontrolled chemical reactions, which are proceeding spontaneously. Many methods of corrosion testing are used to check the corrosion resistance of machines components. Many of these methods are leading to the degradation or destruction of the checked specimens (the atmospheric corrosion testing, laboratory testing by the NSS, AASS, CASS method or solid drops method). The modern corrosion testing methods gives results of corrosion resistance by non-destructive methods testing, e.g. the electrochemical testing. Some of mentioned testing method were used, at first to evaluate the benefit o nitriding and nitrooxidizing to corrosion resistance of some structural steels and at second to judge the agreement of these methods.