Investigating the effect of mechanical processes on corrosion behavior in galvanized DX51 and DX52 quality steels

Galvanizing, a surface coating technique, is a method frequently used to protect steel from corrosion. During the production process of steel sheets manufactured using this technique, issues such as flaking, coating peeling, exposure of uncoated surfaces after cutting, and rapid white rust formation in atmospheric conditions have been encountered. In this study, samples were produced from sheets containing four different steel sheet qualities, consisting of two different steel grades and two different coating weights for each steel grade. While designing the samples, hole and bending forming methods, which are frequently applied to galvanized sheets in the industry, were used. Random samples from each quality of the produced sheets were selected, and coating thickness measurements were performed using the XRD method. Samples from each steel quality were subjected to a salt spray test to evaluate corrosion resistance. Red and white rust samples formed as a result of the salt spray test were taken and analyzed. The most critical design with the most severe hole and bending conditions was selected from these sample designs and exposed to atmospheric air corrosion and industrial conditions (chicken manure) corrosion. At the end of this one-month experiment, differences in coating weights were identified, and the corrosion rates in different environments were compared based on these differences. Consequently, the corrosion behaviors of different quality steel sheets subjected to mechanical processes on galvanized sheets were examined.