Zinc-based phosphating paste

Phosphating Paste
1 Scope of Application
Suitable for degreasing, derusting, and phosphating treatment of steel parts of various shapes and materials. Can be used in conjunction with coating processes such as electrostatic spraying, baking paint, powder coating, and painting.

2 Main Features
Solid packaging, convenient for storage and transportation. Can simultaneously complete the entire process of degreasing, derusting, phosphating, and passivation. Simple process, easy operation, no heating required, energy-saving. Good stability, minimal pollution. Does not contain harmful substances such as NaNO2, NaNO3, NaF, or Cr6+. The gray-black phosphating film is dense, continuous, and uniform, with all indicators meeting national standards. Low comprehensive processing cost. Each kilogram can treat 10-20 square meters of surface. The paste is very easy to rinse off—washes away with a single rinse.

3 Main Technical Indicators
No. Item Indicator
1 Appearance Light green transparent paste
2 Density 1.248
3 Total Acidity (points) 480～570
4 Processing Temperature (°C) Room temperature
5 Processing Time (min) 15～25
6 Phosphating Method Coating/Brushing

4 Process Flow
Remove severe oil stains and rust,
Apply phosphating paste
Rinse with water
Dry

5 Usage Methods and Precautions
5.1 If the workpiece has severe oil stains and rust, degrease and derust first. For minor oil stains and rust, apply phosphating paste directly. Use a brush or roller for application. If the paste is too thick and difficult to apply, add a small amount of water to facilitate brushing. Generally, a thin layer is sufficient, depending on the specific condition of the workpiece.
5.2 After about 20 minutes of application, a dense gray-black phosphating film will form on the metal surface. If immediate painting is required, rinse off the phosphating paste with water, dry, and then paint. Alternatively, dry and remove the phosphating paste before painting without rinsing. If painting is not performed immediately, the phosphating paste does not need to be removed and can provide rust protection for over a year. When ready to paint, remove the phosphating paste thoroughly before painting.
5.3 The phosphating paste is highly acidic. Use protective measures during operation. If it comes into contact with skin, rinse immediately with clean water. Seek medical attention if discomfort occurs.