Blue Etch Anodize

NDT Inspection Method Applicability

Blue Etch Anodizing (BEA) is a specialized, highly sensitive nondestructive testing (NDT) technique to detect 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.

BEA is only applicable to detect discontinuities in titanium materials such as those involved in the manufacture of critical rotating parts for the aircraft and power generation industries. Titanium 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 BEA is to detect material segregations known as “Hard Alpha Inclusions” (HAI), and/or High Aluminum Defects (HAD’s).

MTC Blue Etch Anodize Laboratory Inspection Service

At Metals Testing Company, we have a complete in-house capability of equipment, chemicals, procedures, qualified personnel, waste treatment, environmental related permits, and industry certifications to accomplish high quality BEA related inspections. With regard to aircraft engine manufacturers, MTC is arguably the top independent laboratory in the world certified to perform BEA inspections.

The following are examples of Blue Etch Anodize related specifications that MTC is approved to perform:

Blades during Blue Etch Anodize Processing

Blades during Blue Etch Anodize Processing

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





Common types of parts that MTC BEA processes include any and 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, etc..

FAQ’s for BEA

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