Preliminary Study On The Effect Of Spray Coatings Parameter On Hydrophobic Coating Surfaces

Azman, Yuhanis Aqilah (2017) Preliminary Study On The Effect Of Spray Coatings Parameter On Hydrophobic Coating Surfaces. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Hydrohobocity means the surface of water is repelled with the surface of the sample or specimen. To determine the hydrophobicity surfaces the contact angle has to be measured which are the angle of contact between surfaces of the solid with the surface of liquid or water. The hydrophobic contact angle will be about 90° to 140° where the water will beads up on the surface of solid. The purpose of the invention of hydrophobic surface is to avoid the problem s including corrosion, higher cost in maintaining the cleanness such as curtain glass of building and solar cell. Besides, by applying the hydrophobic also, the materials can be protected. The effect of thickness of spray coating and the effect of surface roughness of the surface was studied further. Two different layers of spray coating was represent the thickness of spray coating where the specimen was sprayed with one layer spray coating and two layer spray coating. The thickness of coating was only being tested on the aluminum plat. For the roughness of the surface, the sand paper grit represented the roughness where the sand paper used were 2000 grit, 1200 grit, 360grit and 180 grit. The lower the sand paper grit, the higher the roughness of surface of sand paper. So, 180 grit of sand paper is the roughest sand paper. For the roughness, aluminium with coating, uncoated copper and uncoated stainless steel was tested. This is to observe whether the trend of effect of roughness on contact angle followed. For the effect of thickness, it showed that as the thickness of the spray coating increased, the contact angle of hydrophobicity decreased. The surface with two layer spray coating has lower contact angle compared surface one layer spray coating. Then, for the effect of surface roughness on hydrophobicity, the results show that by increasing the roughness of surface, the contact angle of hydrophobicity also increased. The contact angle for 180 sand paper grit has highest contact angle followed by 360grit, 1200 grit and 2000 grit.

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