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ABSTRACT
Lacquers have found their application in many industries including the paints, automobile, and construction industries for a very long time. They are widely used in the preservation of antiques and artifacts. However, the stability of the nitrocellulose lacquer adhesive is often criticized. This has necessitated the need for this research - to investigate the effectiveness of nitrocellulose lacquer in the corrosion protection of medium carbon steel in different environments.
Samples of the 0.27% carbon steel were coated with plasticized nitrocellulose lacquer and immersed in freshwater and seawater. Some of the samples were exposed to air. Weight loss method and potentio-dynamic electrode method were used to investigate the corrosion of coated and uncoated samples of 0.27% carbon steel in the various mediums for a duration of 60days. Weight loss data was recorded every 10 days for the 60-day period. The Potentio-dynamic electrode method was used for corrosion tests of the steel in the different mediums. Silver/Silver Chloride (Ag/AgCl) and graphite were used as the reference and counter electrodes in a conventional three electrode polarization system. Surface area of the working electrode was 1.0cm2 and the samples were attached unto the electrode using a conducting aluminum tape. Fresh-water and simulated sea water at room temperature were used as the different mediums. The anodic and cathodic polarization curves were recorded at a constant scan rate of 0.01V/s, fixed between, quiet time was 2s and the Tafel plot, linear polarization was obtained.
Results from the weight loss experiments showed that there were no significant changes in the weight of lacquer-coated samples in the various mediums after 60 days. However, weight loss in the uncoated samples were significant in all the mediums after 60 days. Analysis of variance statistics on the potentio-dynamic electrode method results revealed that the effect of coating of the coupons is significant on the corrosion rate of the steel coupons while the effect of the different environment considered with is insignificant on the corrosion rate of the metal.
