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23 www.wjir.org  Abstract— The effect of Nitric acid on weight loss and fractal dimension for five types of roofing sheets namely, Stone Coated Roofing Sheet (SCRS), Zinc Corrugated Roofing Sheet (ZCRS), Emboss Aluminium Roofing Sheet (EARS), Small Curve Corrugated Roofing Sheet (SCCRS) and Aluminium Zinc Corrugated Roofing Sheet (AZCRS) were investigated. The samples were immersed in acid rain solution simulated from various concentrations of Nitric (HNO3) acid. The experiments were designed using Central Composite Design (CDD) of Response Surface Methodology (RSM) based on three factors. These are concentration c, (0.00 ppm – 350.00 ppm), time of exposure t, (1week – 2week) and pH, (4-7) of acid solution. Weight loss of each sample was determined by the difference in weight before and after immersion in acid solutions. The influences of these parameters on weight loss were obtained from analysis of variance. Microstructural analyses of the corroded samples were carried out using an optical metallurgical XJL-17 microscope while fractal analysis was carried out on the microstructures obtained. At c = 350.00 ppm, t = 1.5 weeks and pH = 4, the highest weight loss of 0.0086 was obtained when ZCRS was immersed in HNO3 solution. The lowest weight loss of 0.0031 was obtained when EARS was immersed in HNO3. Based on ANOVA, the weight loss is significantly influenced by all input variables as well as their combinations. EARS has finer grains which reduce intergranular corrosion. ZCRS with fractal dimension (D) of 1.9618 has the worst level of corrosion HNO3 solution. EARS with D of 1.9177 have the least level of corrosion HNO3 solution.The results showed that time, concentration and pH significantly influence corrosion. It also showed that, EARS has the least weight loss and corrosion level in acidic medium.

Modeling the Effect of Acid Rain of HNO3 on Corrosion Susceptibility of Roofing Sheet