Zinc Phosphating
Coating powders require proper pretreatment, so, zinc phosphating yields the best corrosion protection, high-quality and is frequently used as a pretreatment before powder coating. The arising zinc phosphate layers approximately 7-15 m thick are very effective in protecting steel from rust creep and in adition to this the zinc phosphate coating process can improve the appearance of finished goods through the creation of a uniform gray or black appearance.
Immersion Process
The individual steps, as normally carried out are;
1. Cleaning stage Temperature (°C): 55-95 Time (min) : 5-10
2. Water rinse Temperature (°C): 15-30 Time (min) : 0.5-1.5
3. Activation Temperature (°C): 20-40 Time (min) : 0.5-1.5
4. Phosphating Temperature (°C): 40-60 Time (min) : 3-10
5. Water rinse Temperature (°C): 15-30 Time (min) : 0.5-1.5
6. Post-rinse Temperature (°C): 20-40 Time (min) : 0.5-1.5
Owen
Curing process depends on all sorts of variables, including the product size,shape, thickness, material composition, production throughput and type of powder to be used must be considered. To make the powders cured and hardened, time and temperatures are critical considerations. Due to that the curing temperatures which was specified by the powder supplier, must be used. And with this, the temperature should be exactingly controlled, and the specified curing temperature must be within ±3°C.