Qingdao Icon Chemicals Co., Ltd.
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  • Contact Person : Ms. Chen Anna
  • Company Name : Qingdao Icon Chemicals Co., Ltd.
  • Tel : 86-532-84810168
  • Fax : 86-532-84915346
  • Address : Shandong,Qingdao,West of Da Zaoyuan, Licang District, QingDao City, Shandong Province, China
  • Country/Region : China
  • Zip : 266043

steel phosphate coating

steel phosphate coating
Product Detailed
Related Categories:Paint & Coating
Simple process, no need to adjust the surface. Filming fast. Phosphate coating is thin.

1. Process flow

1.1 Degreasing(alkaline) → Water Rinsing → Rust Cleaning → Phosphating → Water Rinsing → Drying

1.2 Degreasing(acid) → Rust Cleaning → Water Rinsing → Phosphating → Water Rinsing → Drying

1.3 Grease and Rust Cleaning → Water Rinsing → Phosphating → Water Rinsing → Drying

2. Solution preparation (1 ton)

  The weight ratio of phosphate coating agent and water is 1 : 9, that means there are phosphating solution of 100 kg and water of 900 kg in working solution of 1 ton. The pH of working fluid is 3 to 4.

3. Performance indicators

Code number

Items

Indicators

1

Processing Mode

Dipping or Spraying

2

the Weight of Phosphate Coating

1 to 2 vm

3

the Scope of total acid (TA)

25 to 50

4

the Scope of free acid (FA)

1 to 3

5

Temperature

Dipping: Room Temperature

Spraying: 20 to 45 degrees

6

Time

Dipping: 5 to 15 min

Spraying: 2 to 3 min

7

Coating Adhesion (level)

0

8

Wearing Quality 3 % NaCl (H)

> 1

9

The handling capacity of concentrated phosphating liquid (m*m/kg )

> 80

4. Detection method

4.1 Total acidity (points)

  Taking 10 ml working fluid to the conical flask, and adding phenolphthalein indicator of 3 to 5 drops. Titrating above-mentioned solution by 0.1 M sodium hydroxide standard solution from colorless to red. The quantity (ml) of 0.1 M sodium hydroxide standard solution is called the points of total acidity.

4.2 Free acidity (points)

  Taking 10 ml working fluid to the conical flask, and adding bromophenol blue indicator of 2 to 4 drops. Titrating above-mentioned solution by 0.1 M sodium hydroxide standard solution from yellow to blue. The quantity (ml) of 0.1 M sodium hydroxide standard solution is called the points of free acidity.

5. Additions and adjustments (1 ton)

  After using a period of time, phosphating working solution will lose activity. When total acidity is normal, but free acidity is too low, phosphate coating agent can be added.

Theoretical calculations: Adding phosphate coating agent of 5 kg can improve one point of the points of free acidity, and 4.2 kg can improve a total acid points.

steel phosphate coating



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