BS EN 4729:2017规定了铝用三价铬基化学转化涂层 和铝合金。它涵盖了沐浴和润色的应用。它没有给出完整的答案 内部流程说明；这些应在制造商的详细工艺说明中给出。交叉引用:EN ISO 3892（ISO 3892:2000 AS）EN ISO 2812-2（ISO 2812-2:2007）ASEN 4707:2014EN 9137:2012EN ISO 2409（ISO 2409:2013）ASEN ISO 9227:2012购买本文件时可提供的所有现行修订均包含在购买本文件中。

BS EN 4729:2017 specifies trivalent chromium based chemical conversion coatings for aluminium and aluminium alloys. It covers the application by bath but also by touch-up. It doesn't give complete in-house process instructions; these shall be given in the manufacturers detailed process instructions.Cross References:EN ISO 3892 (ISO 3892:2000 AS)EN ISO 2812-2 (ISO 2812-2:2007) ASEN 4707:2014EN 9137:2012EN ISO 2409 (ISO 2409:2013) ASEN ISO 9227:2012All current amendments available at time of purchase are included with the purchase of this document.