Engineering topics

Coston, J. E.

Publications and source records attributed to Coston, J. E..

3 records

NASA NTRS1985

Protective coatings for atomic oxygen susceptible spacecraft materials - STS-41G results

Sixteen materials consisting of metallizations, silicones, and FEP Teflon were applied as protective coatings to selected spacecraft material surfaces and exposed on STS-41G to the LEO atomic oxygen environment. Evaluations of their protective effectiveness were made through assessing their mass loss/gain characteristics, maintenance of base material optical properties, and imperviousness to atomic oxygen attack. Generally, all coatings provided some degree of protection for the underlying material. In some cases the overcoat appeared to be too thin thereby providing inadequate protection.

Whitaker, A. F.↗

NASA NTRS1983

A Milder Solution for Stress-Corrosion Tests

In search for mild corrosive, 14 different salt solutions screened in alternate-immersion tests on 3 aluminum alloys. Best results were obtained with NaCl/MgCl2 solution and with synthetic seawater (contains nearly same proportions of NaCl and MgCl2 along with precise, minute amounts of eight other salts). Because solution is less expensive than artificial seawater, it is probably preferred for future stress-corrosion-cracking (SCC) testing.

Humphries, T. S.↗

NASA NTRS1981

An improved stress corrosion test medium for aluminum alloys

A laboratory test method that is only mildly corrosive to aluminum and discriminating for use in classifying the stress corrosion cracking resistance of aluminum alloys is presented along with the method used in evaluating the media selected for testing. The proposed medium is easier to prepare and less expensive than substitute ocean water.

Humphries, T. S.↗