羟基乙叉二膦酸酸洗后预膜液的选择较少有人研究，而适当的预膜钝化是防止酸洗后金属表面返锈的必要措施。
There is little study on the selection of liquid of pre - filming after the acid wash by hydroxy ethidine phosphonic acid (HEDP).
所述涂料组合物具有较长的贮存期、良好的防白锈性和良好的膜性能。
This coating composition has a relatively long pot life, good white rust resistance, and good film properties.
所获得的黑色钝化膜外观均匀，镀层钝化后经中性盐雾试验(连续喷雾)出现红锈(基体腐蚀)的时间大于1000小时。
The black inactivating film is homogeneous, and the inactivated coating, test shows, has a no red rust period longer than 1000 hr in neutral salt fog.
所获得的黑色钝化膜外观均匀，镀层钝化后经中性盐雾试验(连续喷雾)出现红锈(基体腐蚀)的时间大于1000小时。
The black inactivating film is homogeneous, and the inactivated coating, test shows, has a no red rust period longer than 1000 hr in neutral salt fog.
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