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公开(公告)号：US3808031A
公开(公告)日：1974-04-30
申请号：US16703071
申请日：1971-07-28
Applicant: CHROMALLOY AMERICAN CORP
Inventor： BRILL EDWARDS H
CPC classification number: C23C26/00 , C23C10/02 , C23C10/52 , C23C10/60 , C23F13/02 , Y10S428/941 , Y10T428/12799 , Y10T428/12812
Abstract: A method is provided herewith for the production of multi-metal diffusion coatings on metal articles providing prolonged protection against chemical or galvanic corrosion of the surface of the coated article during prolonged exposure to corrosive conditions, and particularly high saline content marine atmospheres, especially where the protective coating is also subjected to mechanically erosive and abrasive environments, with the multiplicity of coating metals being selected so that the combination thereof provides a coating varying through the thickness thereof from outer surface toward the interface of coating layer and coated article so that the mechanical resistance to chemical corrosion is greatest at the outer surface but decreases as the coating thickness is eroded away, while the components of the coating offering sacrificial or cathodic protection are more concentrated adjacent the coating-article interface so that cathodic protection of the coated article increases as the coating is removed by abrasion or erosion. As illustrative, the outer coating surface includes a high concentration of metallic components inherently resistant to saline corrosion and/or abrasion, although offering less cathodic protection for the coated article; while inner layers of the coating are rich in metallic components offering high sacrificial or cathodic protection, although less erosion or saline corrosion resistance.
Abstract translation: 提供了一种用于在金属制品上生产多金属扩散涂层的方法，其在长时间暴露于腐蚀性条件下，特别是高含盐量的海洋环境中提供延长的防止涂层制品表面的化学或电偶腐蚀，特别是在 保护涂层也经受机械腐蚀和磨蚀环境，其中选择多种涂层金属，使得它们的组合提供从外表面朝向涂层和涂覆制品的界面改变其厚度的涂层，使得机械电阻 化学腐蚀在外表面是最大的，但是随着涂层厚度被侵蚀而减小，而提供牺牲或阴极保护的涂层的组分在涂层 - 物体界面附近更集中，使得涂覆制品的阴极保护增加，因为 coa 通过磨损或侵蚀除去。 作为说明，外涂层表面包括固有地耐盐腐蚀和/或磨损的高浓度的金属组分，尽管对涂层制品提供较少的阴极保护; 而涂层的内层富含金属组分，提供高牺牲或阴极保护，尽管腐蚀或耐盐腐蚀性较差。
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公开(公告)号：US3801353A
公开(公告)日：1974-04-02
申请号：US3801353D
申请日：1972-04-11
Applicant: CHROMALLOY AMERICAN CORP
Inventor： BRILL EDWARDS H
CPC classification number: C23C10/02 , Y10T428/12736 , Y10T428/12861
Abstract: The substrate of a heat resistant alloy is coated with an oxidation resistant coating metal while substantially avoiding the formation of an internally oxidized structure within the coating by embedding a heat resistant alloy article to be coated in a cementation pack comprising said coating metal (e.g. chromium) which has a lower propensity to oxidize than an oxidation resistant solute metal in the alloy (e.g. aluminum), and then subjecting the alloy article to pack cementation at an elevated temperature while maintaining the oxygen in the pack at a partial pressure below the oxygen threshhold level at which the alloy is subject to internal oxidation.
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公开(公告)号：US3711315A
公开(公告)日：1973-01-16
申请号：US3711315D
申请日：1970-10-08
Applicant: CHROMALLOY AMERICAN CORP
Inventor： BRILL EDWARDS H
CPC classification number: C23C10/58 , Y10S428/933 , Y10T428/12757
Abstract: A METHOD IS PROVIDED HEREWITH FOR THE PRODUCTION OF SACRIFICAL ALUMINUM-CONTAINING DIFFUSION COATINGS FOR THE CATHODIC PROTECTION OF FERROUS METAL ARTICLES AGAINST CORROSION, PARTICULARLY IN HIGHLY SALINE ATMOSPHERES, IN WHICH COATING AN ADDITIONAL METAL (SUCH AS MANGANESE) IS INSLUDED TO COMBINE WITH THE ALUMINUM THEREIN TO FORM AN INTERMETALLIC COMPOUND WHICH IS SUFFICIENTLY ANODIC WITH RESPECT TO THE SUBSTRATE AND/OR INTERMETALLIC ALUMINUM COMPOUNDS THEREIN TO PROVIDE THE DESIRED SACRIFICAL OR CATHODIC PROTECTION.
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