AI2O3/Au Composite Coating on Stainless Steel Prepared by Electro-deposition

摘要

Tritium permeation barriers on stainless steels are required in fusion technology in order to reduce the tritium permeation rate through the structural material into the cooling water system. Preparation of tritium permeation barrier AI2O3 is an important way to solve the problem of leakage of tritium permeation. It is worth to note that the noble Au is an excellent barrier of hydrogen dissolution. AI2O3/AU composite coating was designed for potential tritium permeation barrier on stainless steel. The alternation coatings have been prepared by electrochemical deposition method. The processing parameters and subsequent sinter temperature for composite coatings were optimized. The oxidation resistance of the coating has been tested. A hydrogen diffusion test simulating tritium permeation has been conducted to compare the sample with and without coating. Microstructure was examined by scanning electron microcopy (SEM). The results showed AI2O3/AU multi-alternation coatings can be prepared on the surface of stain less steel at the case of controlling processing well. The coatings have the characteristic of high temperature oxidation resistance and good hydrogen permeability barrier. The tritium permeation should be study further.