公开(公告)号：US5660886A

公开(公告)日：1997-08-26

申请号：US427137

申请日：1995-04-24

Applicant: Douglas J. Peterman ,  Joan E. Deffeyes ,  James E. O'Neal

Inventor： Douglas J. Peterman ,  Joan E. Deffeyes ,  James E. O'Neal

IPC: C23C26/00 ,  B05D3/02

CPC classification number: C23C26/00 ,  Y02T50/67

Abstract: An improved protective coating system for metal substrates is described. Nickel-aluminide duplex coatings are improved by adding an effective amount of boron in the nickel coating step and by retaining the boron during the aluminization step. An unexpected result of the retained boron is its non-deleterious effect on oxidation protection. During aluminization, the boron surprisingly migrates to the coating/substrate interface, forming a diffusion barrier in situ. The barrier inhibits both inward diffusion of the nickel-aluminide coating and outward diffusion of substrate impurities. The process enables thinner, less expensive coatings.

Abstract translation: 描述了用于金属基底的改进的保护涂层系统。 通过在镀镍步骤中加入有效量的硼并且在镀铝步骤期间保留硼来改善镍铝化物双相涂层。 保留硼的意想不到的结果是其对氧化保护的无害影响。 在镀铝期间，硼令人惊奇地迁移到涂层/基底界面，原位形成扩散阻挡层。 屏障阻止镍铝镀层的向内扩散和衬底杂质的向外扩散。 该方法可实现更薄，更便宜的涂料。