Process for the phosphatising treatment of steel strip or sheet
galvanized on one side or alloy galvanized on one side
    1.
    发明授权

    公开(公告)号:US5795408A

    公开(公告)日:1998-08-18

    申请号:US596220

    申请日:1996-07-08

    Abstract: The process forms a phosphate coating on a steel strip or sheet having a galvanized or alloy galvanized side and a steel side so that the phosphate coating is only present on the galvanized or alloy galvanized side. This process includes contacting the galvanized or alloy galvanized side of the steel strip or sheet with a phosphatizing solution for 4 to 20 seconds at a temperature of from 45.degree. C. to 80.degree. C. The phosphatizing solution has an S value of from 0.08 to 0.30 and contains 0.5 to 5 g/l zinc, 3 to 20 g/l P.sub.2 O.sub.5, 0.020 to 0.2 g/l nitrite, 3 to 30 g/l nitrate and 0.2 to 2.5 g/l complexing agent for iron. Chelate forming substances, such as tartaric acid, citric acid, ethylenediamine-tetraacetic acid, nitrilotriacetic acid and/or oxalic acid, may be used as the complexing agent for iron. The phosphatizing solutions may also contain other bivalent cations, particularly manganese and/or nickel cations.

    Abstract translation: PCT No.PCT / EP94 / 02510 Sec。 371日期:1996年7月8日 102(e)日期1996年7月8日PCT提交1994年7月29日PCT公布。 出版物WO95 / 04842 日期1995年2月16日该方法在具有镀锌或合金镀锌侧和钢侧的钢带或片材上形成磷酸盐涂层,使得磷酸盐涂层仅存在于镀锌或合金镀锌侧。 该方法包括在45℃至80℃的温度下将钢带或片材的镀锌或镀锌层与磷酸盐溶液接触4至20秒。磷酸盐溶液的S值为0.08至 0.30,含有0.5〜5g / l的锌,3〜20g / l的P2O5,0.020〜0.2g / l的亚硝酸盐,3〜30g / l的硝酸盐和0.2〜2.5g / l的铁络合剂。 可以使用螯合物形成物质,例如酒石酸,柠檬酸,乙二胺四乙酸,次氮基三乙酸和/或草酸作为铁的络合剂。 磷酸盐溶液还可以含有其它二价阳离子,特别是锰和/或镍阳离子。

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