What is the problem with the pickling and phosphating yellowing of the security door

Updated on Security door 2024-07-13
2 answers
  1. Anonymous users2024-01-24

    Phosphate film quality problems or subsequent closure or water problems need to be analyzed on a case-by-case basis.

  2. Anonymous users2024-01-23

    The pre-treatment of the anti-theft door is usually zinc-based phosphating, and the yellowing is a treatment defect, and the phosphating film is incomplete or the treatment process between the processes is not in place.

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