Ferrate conversion coatings for metal substrates
    31.
    发明授权
    Ferrate conversion coatings for metal substrates 失效
    用于金属基材的铁酸盐转化涂层

    公开(公告)号:US06471788B1

    公开(公告)日:2002-10-29

    申请号:US09461944

    申请日:1999-12-15

    IPC分类号: C23C2248

    摘要: A method employing oxide film conversion coatings prepared using ferrate (VI) as the oxidizing agent is disclosed. Metal substrates or surfaces, such as aluminum, aluminum alloys or other metals, are contacted with an aqueous solution comprising ferrate (VI) anions to form a corrosion resistant conversion coating on the surface thereof. The ferrate anion concentration is preferably between about 0.0166% and about 1.66% by weight. The coating process is carried out by dipping, spraying, or painting at temperatures ranging from 25° C. to 100° C. for a period of time ranging from about 1 second to about 5 minutes.

    摘要翻译: 公开了使用高铁酸盐(VI)作为氧化剂制备氧化膜转化膜的方法。 将金属基材或诸如铝,铝合金或其它金属的表面与包含高铁酸盐(VI)阴离子的水溶液接触,以在其表面上形成耐腐蚀转化膜。 高铁酸盐阴离子浓度优选为约0.0166重量%至约1.66重量%。 涂覆过程通过在25℃至100℃的温度范围内浸渍,喷涂或涂漆进行约1秒至约5分钟的时间。

    Isomolybdate conversion coatings
    37.
    发明授权
    Isomolybdate conversion coatings 失效
    异钼酸盐转化涂料

    公开(公告)号:US06432224B1

    公开(公告)日:2002-08-13

    申请号:US09500372

    申请日:2000-02-08

    IPC分类号: C23C2283

    CPC分类号: C23C22/83 C23C22/66 C23C22/68

    摘要: A conversion coating solution and process forms a stable and corrosion-resistant layer on metal substrates or layers or, more preferably, on a boehmite layer or other base conversion coating. The conversion coating process involves contacting the substrate, layer or coating with an aqueous alkali metal isomolybdate solution in order to convert the surface of the substrate, layer or coating to a stable conversion coating. The aqueous alkali metal molybdates are selected from sodium molybdate (Na2MoO4), lithium molybdate (Li2MoO4), potassium molybdate (K2MoO4), or combinations thereof, with the most preferred alkali metal molybdate being sodium molybdate. The concentration of alkali metal molybdates in the solution is preferably less than 5% by weight. In addition to the alkali metal molybdates, the conversion coating solution may include alkaline metal passivators selected from lithium nitrate (LiNO3), sodium nitrate (NaNO3), ammonia nitrate (NH4NO3), and combinations thereof; lithium chloride, potassium hexafluorozirconate (K2ZrF6) or potassium hexafluorotitanate (K2TiF6).

    摘要翻译: 转化涂层溶液和方法在金属基材或层上形成稳定且耐腐蚀的层,或者更优选在勃姆石层或其它碱转化涂层上形成。 转化涂覆方法包括使基底,层或涂层与碱金属异钼酸盐水溶液接触,以将基底,层或涂层的表面转化为稳定的转化涂层。 钼酸钾水溶液选自钼酸钠(Na2MoO4),钼酸锂(Li2MoO4),钼酸钾(K2MoO4)或其组合,最优选的碱金属钼酸盐是钼酸钠。 溶液中的碱金属钼酸盐的浓度优选小于5重量%。 除了碱金属钼酸盐之外,转化涂层溶液可以包括选自硝酸锂(LiNO 3),硝酸钠(NaNO 3),硝酸铵(NH 4 NO 3)及其组合的碱金属钝化剂; 氯化锂,六氟锆酸钾(K2ZrF6)或六氟钛酸钾(K2TiF6)。

    Conversion coatings prepared or treated with calcium hydroxide solutions
    38.
    发明授权
    Conversion coatings prepared or treated with calcium hydroxide solutions 失效
    用氢氧化钙溶液制备或处理的转化膜

    公开(公告)号:US06395106B1

    公开(公告)日:2002-05-28

    申请号:US09499243

    申请日:2000-02-07

    IPC分类号: C23C2800

    摘要: A conversion coating process that forms a stable and corrosion-resistant oxide layer on metal or metal oxide substrates or layers. Particularly, the conversion coating process involves contacting the metal or metal oxide substrate or layer with the aqueous calcium hydroxide solutions in order to convert the surface of the substrate to a stable metal oxide layer or coating. According to the present invention, the calcium hydroxide solution is prepared by removing carbon dioxide from water or an aqueous solution before introducing the calcium hydroxide. In this manner, formation of calcium carbonate particles is avoided and the porosity of the conversion coating produced by the calcium hydroxide solution is reduced to below about 1%.

    摘要翻译: 在金属或金属氧化物衬底或层上形成稳定且耐腐蚀的氧化物层的转化涂覆方法。 特别地,转化涂覆方法包括使金属或金属氧化物衬底或层与氢氧化钙水溶液接触,以将衬底的表面转化为稳定的金属氧化物层或涂层。 根据本发明,在引入氢氧化钙之前,通过从水或水溶液中除去二氧化碳来制备氢氧化钙溶液。 以这种方式,避免了碳酸钙颗粒的形成,并且由氢氧化钙溶液产生的转化涂层的孔隙率降低到低于约1%。