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File Last modified on: Wed Jun 19, 2013 16:32:35
 
An improved protective coating composition for hot dip galvanization of steel
 

Hot dip galvanization is a widely used method for protecting steel from corrosion. In the hot dip galvanization method, the steel material to be coated is dipped in a molten metal bath of zinc or of an alloy of zinc containing alloying elements such as Al, Mg, Ni Co and Mg. Hot dipping can also be followed by heat treatment (annealing) resulting in a Zn-Fe (galvanneal) coating over the steel. The zinc/zinc-based alloy coatings act as sacrificial anode thereby protecting the underlying steel from corrosion.

The invention relates to an improved protective coating composition for hot dip galvanization of steel. An improved protective coating composition for hot dip galvanization of steel, the composition comprising zinc and strontium along with other alloying elements wherein the strontium is present in at least 0.01 to 0.1 % by weight of the composition.

The coatings using strontium containing improves the adhesion strength, delamination resistance as well as corrosion resistance as compared to the coatings using strontium free Zn composition or using the commercial HDG composition. The adhesion strength is improved by around 33%, delamination resistance by around 75% and of corrosion resistance by around 4 times. The improved properties of the coatings ensure superior protection of steel.

Indian patent application no. 247/MUM/2008 Indian patent grant no. 256103
Inventors: V S Raja and S T Vagge