Joeben V. Gubatanga (March 2001)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
This study was conducted to determine at what pH level that caused corrosion on iron and copper in the presence of oxygen at a given period of time. For about thirty days, these metals were tested at different pH levels namely, pH 1, pH 4, pH 7, pH 10, and pH 13. The corrosion of iron and copper strips were measured everyday in terms of weight loss. The mean was used as a descriptive statistical tool to determine the pH level that caused corrosion on iron and copper strips after 30 days. The t-test and One-Way Analysis of Variance (ANOVA) were used as statistical tools in testing the hypotheses. All the inferential statistical tools were set at 0.05 alpha level of significance.
Results showed that there was no significant difference in the degree of corrosion of iron and copper strips when subjected at different pH levels. The degree of corrosion of iron and copper strips before and after each acidity treatments showed no significant difference when subjected to pH 1, pH 4, pH 7, pH 10. However, the degree of corrosion of iron and copper strips before and after each acidity treatments showed significant difference when subjected to pH 13.