Chemical Etch

Chemical Processing & Nondestructive Testing Method Applicability

Chemical Etch (a.k.a., Chem Etch , Macro Etch, Chemical Dissolution) can be used for both cleaning and inspection. It is applicable to nickel and titanium based alloys. Chem etch as an NDT (Nondestructive Testing) method is used to expose grains for evaluation. As such, grains are inspected for size and flow as well as overheat conditions.

Note that chem etch can be used to detect material segregations in nickel-based alloys (i.e., white spots, “freckles”, in black smut condition). It can also be used detect gross material segregations in titanium, however, is not nearly as sensitive as Blue Etch Anodize.

MTC Metal Etching 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 chem etch processing.

The following are examples of chem etch related specifications that MTC is approved to perform:

  • EIM Code 2
  • EIM Code 7 (chem milling)
  • MTV 238
  • LHP6017
  • EMS52390
  • RPS674
  • DMC 0320
  • DMC 0324
  • DMC 0330
  • DMP12-107
  • DMP13-049 (Ti pickling)
  • CP3605
  • AMS 2643
  • P4TF2
  • P4TF3
  • P4TF4
  • P4TF8 (swab etch)
  • C5049 (Ti cleaning)
  • PWA 116 (Ti cleaning)
  • RRP 51001

Common types of parts that MTC chem etch processes include any and all critical rotating parts, fan blades, compressor blades, compressor vanes, fan cases, discs, disks, housings, sonic shape forgings, splines, shafts, hubs, engine cases, segments, spacers, flanges, links, rings, castings, etc.

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