Provided are: a method for pre-coating treatment of an automobile body comprising a high-tension steel plate, said method being capable of obtaining satisfactory corrosion resistance after coating; and an automobile body. The solution of the present invention is a coating pretreatment method for an automobile body, in which an alkali degreasing step, a first water washing step, a chemical conversion treatment step, a second water washing step, and a cationic electrodeposition coating step are performed in this order, a chemical conversion treatment agent used in the chemical conversion treatment step contains zirconium (A), free fluorine ions (B), an allylamine-diallylamine copolymer (C), aluminum ions (D), and nitrate ions (E), each of which has a prescribed concentration, the allylamine-diallylamine copolymer (C) forming an acid addition salt having an anionic counter ion, the pKa of the acid being within the range of-3.7 to 4.8, and the pKa of the acid being within the range of-3.7 to 4.8. The content ratio of diallylamine is from 80 mol% to 98 mol% (inclusive).

    本发明提供能够得到涂装后的令人满意的耐腐蚀性的、包含高张力钢板的汽车车体的涂装前处理方法和汽车车体。本发明的解决方法是一种汽车车体的涂装前处理方法,其依次进行碱脱脂工序、第一水洗工序、化学转化处理工序、第二水洗工序、阳离子电沉积涂装工序,化学转化处理工序中使用的化学转化处理剂含有各自规定浓度的锆(A)、游离氟离子(B)、烯丙胺‑二烯丙胺共聚物(C)、铝离子(D)和硝酸根离子(E),烯丙胺‑二烯丙胺共聚物(C)形成具有阴离子性抗衡离子的酸加成盐,酸的pKa在‑3.7~4.8的范围内,二烯丙胺含有比率为80摩尔%以上且98摩尔%以下。


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    Title :

    Coating pretreatment method for automobile body and automobile body


    Additional title:

    汽车车体的涂装前处理方法和汽车车体


    Contributors:

    Publication date :

    2022-10-04


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    C23C Beschichten metallischer Werkstoffe , COATING METALLIC MATERIAL / B62D MOTOR VEHICLES , Motorfahrzeuge / C25D Verfahren für die elektrolytische oder elektrophoretische Herstellung von Überzügen , PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS



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