Anodic Etch

NDT Inspection Method Applicability

Anodic etch is both a chemical process and nondestructive testing method. When used as an inspection method, anodic etch detects grain structure, grain size, inclusions, other surface breaking defects, and segregation problems such as white spots. At the same time, it also serves the purpose of removing interfering material as a preparation for subsequent fluorescent penetrant inspection (FPI).

It is only applicable to stainless steels and nickel based materials.

MTC Anodic Etch 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 Anodic Etch processing. We also have the expertise to design associated fixtures, a critical element in the proper application of anodic etch processing.

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

  • MTV 224
  • CEIM-1
  • EIM Code 1
  • RPS 674

Common types of parts that MTC Anodic Etch processes include spacers, seals, shafts, hubs, rings, plates, blades, vanes, discs, knife edge seals, seal fins, nozzle guide vanes, compressor discs, compressor blades, turbine discs, turbine blades, and other nickel alloy parts within the hot section of a gas turbine aircraft engine, critical rotating parts, and other similar applications.

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