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1. 发明授权

US6068711A Method of increasing corrosion resistance of metals and alloys by treatment with rare earth elements 失效
公开(公告)号：US6068711A
公开(公告)日：2000-05-30
申请号：US863935
申请日：1997-05-27
申请人： Yucheng Lu , Michael Brian Ives
发明人： Yucheng Lu , Michael Brian Ives
IPC分类号： C23C22/48 , C23C22/50 , C23C22/52 , C23C22/56 , C23C22/68
CPC分类号： C23C22/56 , C23C22/48 , C23C22/50 , C23C22/52 , C23C22/68
摘要： There is provided a method for treating the surface of metals such as nickel based or high alloy steels, austenitic and ferritic stainless steels, copper and aluminum alloys to increase their corrosion resistance by modification of the metal surfaces to inhibit cathodic corrosion processes. In a single step treatment process the metals are immersed into a heated aqueous composition containing a rare earth salt substantially free of any halide compound. Increased corrosion resistance is obtained using nitrates of yttrium, gadolinium, cerium, europium, terbium, samarium, neodymium, praseodymium, lanthanum, holmium, ytterbium, dysprosium, and erbium nitrates. The rare earth salt is present in the range from about 2% by weight to saturation of the solution. The composition includes a pH-modifying substance such as nitric acid to adjust the pH in the range 0.5 to about 6.5 to attack the surface to remove oxides facilitating deposition of the rare earth. For aluminum alloys the pH is maintained between 4.5 to 6.5, for nickel based alloys and austenitic stainless steels the pH is maintained between 0.5 to 3.5 and between pH 2.0 to 4.5 for ferritic stainless steels. The surface can also be conditioned by abrasion before or during immersion in the composition. Increased corrosion resistance is achieved by immersion for time periods in the range of a few minutes up to one hour with the composition maintained between 60 to 95.degree. C. Cerium, gadolinium, neodymium and praseodymium nitrate when used alone produced the greatest degree of corrosion resistance compared to the other rare earth nitrates. Significant synergistic effects are observed when combinations of two or more rare earth nitrates are used in the compositions. Aqueous treatment solutions based on combinations of cerium nitrate, gadolinium nitrate and lanthanum nitrate are very effective in reducing crevice corrosion.

2. 发明授权

US06406562B1 Method of increasing corrosion resistance of metals and alloys by treatment with rare earth elements 失效
标题翻译：通过稀土元素处理提高金属和合金的耐腐蚀性的方法
公开(公告)号：US06406562B1
公开(公告)日：2002-06-18
申请号：US09572699
申请日：2000-05-16
申请人： Yucheng Lu , Michael Brian Ives
发明人： Yucheng Lu , Michael Brian Ives
IPC分类号： C23C2282
CPC分类号： C23C22/56 , C23C22/48 , C23C22/50 , C23C22/52 , C23C22/68
摘要： There is provided a method for treating the surface of metals such as nickel based or high alloy steels, austenitic and ferritic stainless steels, copper and aluminum alloys to increase their corrosion resistance by modification of the metal surfaces to inhibit cathodic corrosion processes. In a single step treatment process the metals are immersed into a heated aqueous composition containing a rare earth salt substantially free of any halide compound. Increased corrosion resistance is obtained using nitrates of yttrium, gadolinium, cerium, europium, terbium, samarium, neodymium, praseodymium, lanthanum, holmium, ytterbium, dysprosium, and erbium nitrates. The rare earth salt is present in the range from about 2% by weight to saturation of the solution. The composition includes a pH-modifying substance such as nitric acid to adjust the pH in the range 0.5 to about 6.5 to attack the surface to remove oxides facilitating deposition of the rare earth.
摘要翻译：提供了一种用于处理镍基或高合金钢，奥氏体和铁素体不锈钢，铜和铝合金等金属表面的方法，通过改变金属表面以抑制阴极腐蚀过程来提高其耐腐蚀性。在单步处理工艺中，将金属浸入含有基本上不含任何卤化物的稀土盐的加热含水组合物中。使用钇，钆，铈，铕，铽，钐，钕，镨，镧，钬，镱，镝和硝酸铒的硝酸盐可以获得提高的耐腐蚀性。稀土盐以约2重量％至溶液饱和的范围存在。组合物包括pH调节物质如硝酸，以将pH调节在0.5至约6.5的范围内以侵蚀表面以除去促进稀土沉积的氧化物。

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