Description

Iron phosphate coating is the most used method of phosphate coatings mainly consist of spraying lines. It is preferred for its easy maintenance, simple control and lower operating costs despite having lower corrosion resistance than zinc phosphate coating. Iron phosphating is suitable for iron, steel and galvanized (zinc) metals in immersion or spray treatment lines. Neutral degreasing chemicals can be used in iron phosphating bath, so that degreasing and phophate coating can be made in the same treatment bath. Use concentration of the iron phosphate coating chemicals are less when compared to zinc phosphate coating. Iron phophate process has also the advandage of low formation of phosphate sludge.

GEETREAT-IP478 – Spray Iron Phosphate

GEETREAT-IP478 is a spray application iron phosphate product suitable for the treatment of iron, steel. It is used with pH optimizer while preperation of the bath. High paint adherance and superb corrosion resistance can be obtained in case of all parameters of the phosphating bath are applied well. It is possible to reach salt spray test results similar to zinc phosphate coating in case of polyester powder coating is applied after iron phosphate. Passivation treatment provides better paint adherance after phosphating. Degreasing can be employed in iron phosphate coating lines separately or combined with iron phosphating solution. Neutral degreasers can be used together, alkaline degreasers can be only used in a separate bath. Coating weight is between 0,2 – 1,0 g/m². Treating temperature must be between 50-55 °C deg. It is ipmortant hold pH value of the iron phosphate bath in the range of 4,0 – 5,5 to get proper coating. Depending on total acid and temperature, phosphate coating is formed on the surface in 3 – 4 minutes with a spray pressure of 1,2 – 1,6 bar.