In a new painting line，an abnormal phenomenon was found that coarse and loose cristals on phosphating film of car body occured.Through analysis in detail of the surface state of the steel sheets，parameters of the tank content，property，water quality and temperature of the surface conditioning process，and the parameters of the phosphating tank，it was concluded that the high surface conditioning temperature and the low total phosphating acid were the key influent factors.To solve these problems，one way was to reduce the conditioning temperature by lowering the degreasing temperature，add fresh industry water spray before conditioning and increase the air valve opening.The other way was to increase the total acid by replacing the faulty phosphating circulating pump.Finally，the problem of crystallization of phosphating film wassolved completely to ensure a smooth production on-site and a stable quality of car body.
LAN Rong-Fu
. Analysis and Discussion on Causes and Countermeasures for Abnormal Phosphating Film of Car Body[J]. Paint & Coatings Industry, 2019
, 49(8)
: 69
-74
.
DOI: 10.12020/j.issn.0253-4312.2019.8.69
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