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As pitting corrosion proceeds hydrogen ions are consumed. The possibility of using the pH change as an indicator for the pitting corrosion resistance properties of Mg alloy was investigated. Mg alloys for testing were mounted in epoxy resin with an area of 0.5 mm 2 area exposed to the solution (5wt% NaCl). A small volume of solution, about 4 cm 3 , was used in order to intensify the pH change. All tests were conducted at room temp. (20°C). The effects of the solution pH and the changes in pH were investigated. The behaviour of pH change obtained from these tests showed that pitting corrosion proceeded through two steps: pitting initiation and pitting propagation. Similar results were obtained for all the alloys tested.Brought to you by | Purdue University Libraries Authenticated Download Date | 6/22/15 3:05 PM