The Statistic Evaluation of the Quality of the Surface Treatments

Stanisław Borkowski

The article deals with evaluation of the quality of the surface treatment on the service life of the experimental samples. We have tested two sets of samples, which was pre-treated by the different ways. We have used one kind of material – laboratory used material Q-panel Fe - for the experiment. The material was pre-treated by mechanical pretreatment (soft blasting) and chemical pre-treatments (alkaline degreasing, ferric phosphate and zirconium nanopassivation). For all samples it was measured the thickness of the coated layer before insertion into the spray chamber at five points of the each experimental sample and for all chemical pre-treatments was measured surface roughness. The results are summarized in tables and graphs. Then the samples were placed in to corrosion chamber and subjected to salt spray corrosion test. The sample loading time was chosen according to the standard for 480, 720 and 1000 hours. The samples were compared with each other and their status was evaluated after corrosive load in corrosion chamber after removal from the corrosive environment. Experimental samples were statistically evaluated according to the thickness measurement of coated layer, chemical pre-treatment surface roughness and their effect on the corrosion resistance of painted sheet metal.