As part of the subject matter, „Inhomogenität“ and thus related process, extensive methods has been developed for analysis of the component “Ventilstück”, which is manufactured at the Robert Bosch AG at Hallein. For these studies, tracking sheets were created, as well as exper-iments which should prove a surface alteration in combination with fluids for antioxidant, cleaning processes and surface activation steps. Through this analysis, process changes could be created, as well as measures for a future reduction in the number of rejects. As part of the evaluation, there was a reduction in the total number of bad parts, which turned out to be cre-ated as result of the oven tightness. As part of a system establishing a leak check was intro-duced into the process. Aspects like context between pickling media and stability time of it, as well as the connection between the nitration process, could not be confirmed.