| Abstrakt: |
Grade E335 steel, low alloyed with Mo–Ni–Cr–Cu is a high strength material used in various constructions. However, it has a major weakness, it wears easily in an acidic corrosive environment when exposed to intensive mechanical friction. It is therefore protected by layer of NiAlMo coating by thermal spraying. In this study, the mass loss of this coating is studied by subjecting it to friction in a gaseous atmosphere of a mixture of nitric, phosphoric and sulphuric acid vapour by varying time, strength and speed of wear. The combined effect on the thermally sprayed coating on a substrate of mechanical friction and chemical attack by corrosion causes increased wear of the protective layer. This is frequently the case in industrial plants, where production is interrupted and money is lost. Here, the aim is to study the interaction effect of the factors causing this wear and then find the values of these factors that minimise it. The originality of this approach is not to study the effect of each factor one by one only, but to see the combined effect of all these factors at the same time, with modelling using experimental designs. The modelling of the phenomenon gives interesting results of the mass loss. A profound analysis shows the effect of the 3 factors on the mechanical-chemical wear taken separately, but also their interactions. The treatment of these results shows the best solution to adopt during the use. [ABSTRACT FROM AUTHOR] |
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