Exposure tests of the C-ring specimen in ammoniacal environments were carried out to investigate stress corrosion cracking of a pure copper tube. As a result, intergranular corrosion or intergranular cracking was occurring on the surface of phosphorous deoxidized 1/2H-tempered and O-tempered copper tubes under gas-phase ammonia derived from 1 % and 3 % ammonia water,
To put the high-temperature erosion-corrosion-resistant alloys developed in the laboratory tests into practical use as thermal spray coatings, we examined the possibility of making them self-fusing alloys. Ni-Fe based developed alloys containing high concentrations of Fe produced granular protrusions during the remelting treatment, and smooth alloy surfaces like those of normal self-fusing alloys could not be obtained.