Читать книгу Root Cause Failure Analysis - Trinath Sahoo - Страница 125

A chemical analysis is sometimes performed by the Metallurgical Expert to determine bulk chemistry, local elemental concentration, surface corrosion products, and coating chemistry. A failed component chemically analyzed to determine whether the grade is indeed as claimed, because mixes occasionally occur at the mill, in the warehouse, or at the fabrication or manufacturing shop. A small percentage of all failures are caused by grade mixes. Chemical analysis can verify conformance to a standard or specification, detect impurities, identify alloys, and analyze trace elements. Analytical chemistry can be performed by a variety of techniques including optical emission spectroscopy, atomic emission spectroscopy, and inductively coupled plasma analysis, to name a few.