COLORIMETRIC CORROSION TESTING OF P M STAINLESS-STEEL/

The corrosion behavior of P/M stainless steel is determined by measuri ng the amount of iron dissolved from the test specimen in a 5w/o NaCl solution as a function of time. The ferrous ions are complexed with 1, 10-phenanthroline, and the intensity of the resulting orange-red color is measured with a spectrophotometer and related to the iron concentr ation. The relative corrosion resistance of twenty-eight P/M sintered stainless steels, including fourteen proprietary alloys containing tin and copper, was determined by the colorimetric method and compared to the results obtained by the salt spray and immersion appearance metho ds.