公开(公告)号：US3753758A

公开(公告)日：1973-08-21

申请号：US3753758D

申请日：1970-09-15

申请人： NAT STEEL CORP

发明人： SHANLEY J

IPC分类号： C21D3/04 ,  C23C8/60 ,  C23C8/62 ,  C23C8/66 ,  C23C10/38 ,  C23C11/04

CPC分类号： C23C8/60 ,  C21D3/04 ,  C23C8/62 ,  C23C8/66 ,  C23C10/38

摘要： Chromized ferrous metal sheet material is prepared by a novel open pack chromizing process. In practicing the process, an adhesive composition, an adherent particulate coating of a source of chromium, and dispersed adherent spacing particles are applied on at least one side of the ferrous metal sheet material. The spacing particles are substantially uniform in size and larger than the chromium particles. The adhesive composition has an adhesive characteristic under the conditions of the process whereby an adherent coating containing the inert particles and chromium particles is formed in the absence of compaction. A plurality of layers of the coated sheet material are assembled into a pack, and the resulting open pack is subjected to an elevated chromizing temperature in a protective atmosphere and in the presence of a halogen-containing energizer to produce chromized ferrous metal sheet material. The adhesive for the spacing particles and chromium particles preferably includes the halogen-containing energizer. The invention further provides composite ferrous metal sheet material coated with the adhesive, the chromium particles and the spacing particles which is especially useful for preparing open packs for chromizing. The invention is also useful when practicing other processes wherein ferrous metal or other metal sheet material is heat treated, such as carburizing, decarburizing, nitriding and diffusion processes in general wherein a metallic or a non-metallic substance is intimately contacted with the ferrous metal or other metal sheet material and diffused into the surface thereof.

摘要翻译： 镀铬黑色金属片材通过新型开包镀层工艺制备。 在实施该方法中，将粘合剂组合物，铬源的粘附颗粒涂层和分散的粘附间隔颗粒施加到黑色金属片材的至少一侧上。 间隔颗粒的尺寸基本上是均匀的并且大于铬颗粒。 粘合剂组合物在该方法的条件下具有粘合特性，由此在不存在压实的情况下形成含有惰性颗粒和铬颗粒的粘附涂层。 将多层涂覆的片材组装成包装，并且在保护气氛中和在含卤素活化剂的存在下使所得开放包装体经受升高的铬化温度，以产生铬化的黑色金属片材。 用于间隔颗粒和铬颗粒的粘合剂优选包括含卤素的激发剂。 本发明还提供涂覆有粘合剂的复合黑色金属片材，铬颗粒和间隔颗粒，其特别用于制备用于铬化的开放包装。 本发明在实施其它方法中也是有用的，其中黑色金属或其它金属片材料被热处理，例如渗碳，脱碳，氮化和扩散过程，其中金属或非金属物质与黑色金属紧密接触或 其他金属片材并扩散到其表面。