Accession Number:

ADA099328

Title:

Resistance of Coated and Uncoated IR Windows to Seawater Corrosion. Phase V. Summary

Descriptive Note:

Final rept. Jun-Nov 1980

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s):

Report Date:

1981-02-01

Pagination or Media Count:

61.0

Abstract:

Specimens of germanium, chalcogenide glass, and zinc selenide were submerged in seawater for testing periods up to 4 months and the deterioration of their surface was noted. Some of the specimens tested were coated with single- or multiple-layer antireflection AR coatings, while others had protective coatings of various types or were bare. The specimens were subjected when submerged, out of the water, or both to several procedures designed to inhibit fouling. Chalcogenide AMTIR-1 Ge33As12Se55 glass specimens and germanium coated with AMTIR-1 chalcogenide glass exhibited excellent corrosion resistance. The multilayer durable antireflective coating, Exotic Materials 40100, although not as corrosion-resistant as chalcogenide glass coating, exhibited the best corrosion resistance of all the AR coatings tested in the study. Antireflective, thick carbon coating applied to germanium by Honeywell, Inc, provided good corrosion resistance but still suffered from a larger amount of pinholes than the best multilayer AR coating tested. It had the advantage, however, of excellent hardness and scratch resistance which was significantly superior to any other coating tested in this study.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Marine Engineering
  • Infrared Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE