Addressing Corrosion Issues
Through Microscopy: A Case Study
THE PROBLEM: A sample of a corroded stainless steel panel was received with the request that we identify the cause of the corrosion.
THE ANALYSIS: Visual inspection of the panel indicated widespread pitting and corrosion. A portion of the panel was cut and analyzed using an electron microscope. The analysis indicated chromium and iron are the base metals of the alloy, and there was abundant chlorine present.
THE IMAGE: Figure 1 shows an optical image of the pitting. Figure 2 shows an electron image of a pit with corrosions.
THE OUTCOME: MVA’s results showed that the pitting corrosion on the steel panel was caused by chloride attack. The manufacturer was able to trace the source of the chlorine and fixed the corrosion problem.