Balogun, T: Performance Evaluation of Corrosion in Pipeline

The performance behavior of four corrosion resistance coating materials applied for protection of pipeline metal were studied. These coating were: polyvinyl resin, an organic zinc, epoxy resin, an epoxy poly-amide and an epoxy ester. The performance of these coatings were evaluated under the same conditions of coating thickness, temperature, pH of corrodant, and exposure time. Considering the particular corrosive medium (acidic or alkaline), the most suitable coating were ascertained, under the same test conditions. The coatings were applied on a low carbon steel metal (coupon) and immersed in both acidic and alkaline environment of usage. Results obtained indicates that corrosion rate decreases with increase in coating thickness beyond which it beings to increase. The results also showed that corrosion rate increases with temperature and acidity (decrease in pH) and also with increase in duration of usage.