| 摘要 |
Hydrogen diffusion through metal is reduced by coating the metal surface with a phosphate radical-contg. phosphate glass-forming material and heating to >=350 degrees C to form the glass. The method is esp. useful for preventing diffusion of radioactive tritium through the walls (e.g. of stainless steel) of primary fluid-contg. appts. of a nuclear reactor (esp. a fast breeder or fusion reactor). The method can also be used to reduce hydrogen embrittlement or reduce leakage in a H2-O2 fuel cell. The phosphate radical reacts with metal oxides or metals at the surface being coated to provide a self-cleaning action and form an adherent glass coating. In the case of reactor piping (e.g. fast breeder reactor piping operating at about 550 degrees C), the glass can be formed on the piping in situ using heat from reactor operation, thus obviating the need for special furnaces. At operating temp. in reactor piping, the glass softens so that cracking is avoided during temp. cycling. |
