Blue Etch Anodizing NDT Inspection Method

Blue etch anodizing (BEA) is a specialized, highly sensitive non-destructive testing (NDT) technique for detecting surface discontinuities such as laps, cracks, material segregation, heat-treating imperfections and abnormalities caused by machining. Under normal conditions, surface defects as small as .015” can be reliably detected through the blue etch anodizing methodology.

Blue etch anodizing is only applicable to the detection of discontinuities in titanium materials such as those used in the manufacture of critical rotating parts for the Aerospace and Power Generation industries, where titanium is is primarily used in the front “cold section” of a gas turbine aircraft engine due to its light weight, performance and temperature limitations.

One of the most critical applications of blue etch anodizing is to detect material segregations known as “Hard Alpha Inclusions” (HAI) and High Aluminum Defects (HAD’s).

Blue Etch Anodizing Laboratory Inspection Service

Element offers world-leading blue etch anodizing inspections for aircraft engine manufacturers with a full range of capabilities, approvals and certifications for the following specifications:

  • AMS 2642
  • P3TF25
  • EMS57930
  • MTV 187
  • CEIM-3
  • EIM Code 3
  • EIS810
  • DMC 0326
  • RRP 51001
  • D01908

Our blue etch anodizing program covers all titanium critical rotating parts, fan blades, compressor blades, compressor vanes, fan cases, 1-2 spools,  discs, disks, sonic shape forgings, splines, shafts, hubs, engine cases, segments, spacers, flanges, links, rings, and more.

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