Abstract

The lifespan of domestic water geysers drastically reduces over a period of time of usage due to environmental challenges such as corrosion and scale development. The objective to be achieved here is to increase the property of corrosion resistance of internal components of the geyser and overcoming the challenges posed by such. A steel plate is to be coated with a nano-film of specified thickness using thermal spray coating consisting of nano-alumina, nano-zinc oxide and nano-molybdenum. These elements were chosen for their high corrosion resistance and formation of a superior alloy coating. The coating elements are mixed in three different ratio combinations, and each is coated on three stainless steel sample plates. These sample plates are tested for corrosion and scale development by performing a salt spray test for a period of time till visual examination shows the development of corrosion. A comparison of the results of the three samples is analysed with industry standards to determine the suitable alternative for geyser coatings. The results have convincingly proved that there is an increase in the life expectancy of the geyser which can significantly reduce maintenance expenditure.

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