Abstract
This study investigates the corrosion failure mechanism of Zn-Al-Mg (ZAM) coatings in environments containing sulfur dioxide (SO2) and ammonia (NH3) gas through accelerated corrosion tests. A comparison with Galvalume (GL) coatings reveals that ZAM coatings exhibit lower corrosion rates than GL coatings in SO2-containing environments, but display higher corrosion rates in NH3-containing environments. Analysis of the cut-edge corrosion of ZAM-coated steel in these environments reveals noticeable delamination phenomenon, with significant discrepancies observed in the corrosion failure times among different cut-edges of the same sample. This disparity can be attributed to both the uneven distribution of coating caused by processing techniques and the detrimental effects of SO2 and NH3 on the corrosion resistance of surface corrosion products. Notably, the diminished corrosion resistance in NH3-containing environments underscores the pivotal role of environmental factors in coating failure.
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