Family Owned Enterprise

Focus On Professional Powder Coating System Solution
You are here: Home » Service » News » Industry News » Frequent problems in metal phosphating treatment and countermeasures

Recent News

Frequent problems in metal phosphating treatment and countermeasures

Views: 200     Author: Near     Publish Time: 2019-01-04      Origin: Site Inquire

Asl metal phosphating is one of the common measures for metal surface treatment, but in the process of operation, metal phosphating is prone to defects and affect the treatment effect, then metal phosphating often has defects and solutions.

1. The phosphating part returns to rust.

Cause: The free acidity is too high, the Fe2+ ion concentration is too high, and the phosphating time is insufficient.

Solution: Adjust the acid ratio, clear the tank or treat with hydrogen peroxide to prolong the treatment time.

2. The film is uneven and has flow marks.

Cause: The oil removal is not clean, the phosphating temperature is low, and the workpiece has a passivation layer.

Solution: Strengthen degreasing, raise temperature, and pickle.

3. The film has blank spots.

Cause: The phosphating temperature is too low, the workpieces are placed too densely or overlapping, and the acid ratio is too large.

Solution: Increase the temperature, increase the gap between the workpieces, and adjust the acid ratio.

4. Hang the ash.

Cause: There is sediment in the bath, the phosphating solution is not cleaned, and the C content of the phosphating solution is too high.

Solution: Remove the precipitate, re-phosphate after pickling, adjust the amount of phosphating solution C.

5. The film is coarse.

Cause: The Fe2+ ion content is too high, the phosphating solution C content is high, and the temperature is too high.

Solution: Change the bath or treat with hydrogen peroxide, adjust the amount of phosphating solution C, and cool down.

6. The film appears colored red spots.

Cause: The free acid is too low, the phosphating solution C content is too high, and the material contains heavy metals.

Solution: Add the stock solution, delay consumption or add urea to analyze the material.

IMG_0681Hebei Hanna Technology Co.,Ltd is China’s largest powder coating equipment manufacturer,since 1990 .

From the production of the simplest manual powder coating machine to the full automatic powder coating line.

Want to know more about powder coating equipment, please contact us.

Product Inquiry

Related Products

Contact Us

Hebei Hanna Technology Co.,Ltd
 Economic and Technology Development Zone, Shijiazhuang city, Hebei Province, China
 +86-186 3213 8668  (Mark Lee)
Hebei Hanna Technology Co., ltD.



 Hebei Hanna Technology CO., LTD
 Shuguang road,Zhengding county,Shijiazhuang city,Hebei province,China
 +86-186 3213 8668  (Mark Lee)
 +86-311-85290396 (Reply within 24 hours)                                                  Powder:
 © 2020 Hebei Hanna Technology CO., LTD.  all rights reserved.    sitemap.xml  冀ICP备18001507号-1