Hot-dip zinc coatings - A comparative study

Comparative characteristics studies were done by physical and chemical analysis of zinc coated materials obtained from different sources. Several technqieus were used to characterise the coatings, such as EDAX for elemental analysis, thickness measurements using SEM and evolution of corrosion resistance of galvanised sheets in a salt spray, sulphur dioxide and immersed in 5M sodium hydroxide solution. It was found that SC type of samples produced the best coating in the environment of marine and industrial pollution of sulphur dioxide but in sodium hydroxide environment, it was not the best.