Investigation of Factors Affecting Corrosion Rate Determination by Resistance Polarization
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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This investigation sought to design and test an apparatus for use in operating environments to reliably and accurately indicate, by galvanostatic resistance polarization techniques, the metal surface corrosion rate. Using two high purity iron specimens with different impurity content, tests were conducted in hydrogen saturated and aerated environments of 1N and 0.1N sulfuric acid and 3 sodium chloride0.5N potassium sulfate. BOTH GRAPHICAL AND COMPUTERIZED LINEAR REGRESSION TECHNIQUES WERE USED TO DETERMINE SPECIFIC RUN AND AVERAGE POLARIZATION RESISTANCE VALUES. Weight-loss tests were conducted simultaneously with resistance polarization tests to provide comparative actual corrosion rate information. Actual corrosion damage was found most dependent upon grain orientation, electrolyte agitation, and the specific impurity content.
- Properties of Metals and Alloys
- Test Facilities, Equipment and Methods