公开(公告)号：US5944909A

公开(公告)日：1999-08-31

申请号：US17161

申请日：1998-02-02

申请人： Jim D. Reeves ,  Howard J. Farr ,  Warren D. Grossklaus, Jr. ,  Jerald M. Kauffman ,  Randall L. Hobbs ,  Patricia A. Charles ,  Eric C. Hemsath ,  Scott A. Welsh

发明人： Jim D. Reeves ,  Howard J. Farr ,  Warren D. Grossklaus, Jr. ,  Jerald M. Kauffman ,  Randall L. Hobbs ,  Patricia A. Charles ,  Eric C. Hemsath ,  Scott A. Welsh

IPC分类号： C09K13/04 ,  C23F1/44 ,  B08B3/08 ,  C23G1/02

CPC分类号： C23F1/44 ,  C09K13/04

摘要： A method of removing metallic compositions, such as abradable rub coatings, environmental coatings, bond coats and braze alloys, from the surface of a cobalt-base substrate, such as turbine shrouds and vanes of gas turbine engines. The method is particularly suited for the removal of nickel-base braze alloys and aluminum-containing coatings, the latter of which includes abradable MCrAlY coatings and environmentally-protective diffusion aluminide coatings. The process generally entails contacting such metallic compositions with an aqueous solution containing hydrochloric acid and nitric acid and at a solution temperature of about 130.degree. F. to about 180.degree. F. The solution completely removes nickel-base alloys and aluminum-containing compositions from a cobalt-base substrate without removal or damage to the underlying substrate.

摘要翻译： 从诸如燃气涡轮发动机的涡轮罩和叶片的钴基基板的表面去除金属组合物的方法，例如可磨擦的摩擦涂层，环境涂层，粘合涂层和钎焊合金。 该方法特别适用于去除镍基钎焊合金和含铝涂层，后者包括耐磨的MCrAlY涂层和环保型扩散铝化物涂层。 该方法通常需要使这种金属组合物与含有盐酸和硝酸的水溶液和约130°F至约180°F的溶液温度接触。该溶液从镍基合金和含铝组合物中完全去除 钴基底物，而不去除或损坏底层基底。