PROCESS EXAMPLE

Overview

In this example, mild steel components with rust and oil on the surface are given an iron phosphate coating and prepared for subsequent powder coating. 

If the steel is relatively clean (eg light oil) with no rust or scale, it is possible to start with the phosphate stage as Bonderite 1070 is a "cleaner/coater".

Steps

• Degrease 

• Rinse

• Derust 

• Rinse 

• Iron Phosphate 

• Rinse 

• Passivate 

• Final rinse * (Deionised water optional) 

• Dry

Degrease - Parco Cleaner 2074 HD

Parco Cleaner 2074 HD is a Heavy Duty Alkaline Immersion Cleaner designed for the removal of lubricants, draw lubes and heavy oils from production parts after forming. It is also used for general-purpose heavy duty cleaning of metal surfaces. 

Derust - Industrial Grade Hydrochloric Acid + P3 Rodine 60 

P3 Rodine 60 is a liquid inhibitor for hydrochloric acid will effectively stop hydrochloric acid attack on steel. This provides excellent protection to the components while allowing the acid to remove any rust. 

Iron Phosphate - Bonderite 1070 

Bonderite 1070 is a cleaner and coater formulated for spray and immersion application to steel, aluminium and zinc surfaces to simultaneously clean and develop a conversion coating. The process produces a uniform non-metallic phosphate coating, which inhibits corrosion and increases the adhesion and durability of paint and powder finishes. Process tanks and housings may be fabricated from mils steel plate, however, equipment life will be greatly extended by using a 300 series alloy stainless steel, such as 304L or 316L. The 316L being preferred for maximum tank life. In all cases approved welding techniques must be used.

Passivate - Parcolene 3 

Parcolene 3 is a passivating rinse used as the final treatment over Bonderite coatings of the iron phosphate type. It is used either by spray or immersion application. Parcolene 3 increases the corrosion resistance of iron phosphate coatings and improves the adhesion of paint finishes. 

Rinses - Between stages

After each treatment, the work is thoroughly rinsed with water at ambient temperature for 20 - 40 seconds. The rinse should be continuously overflowed, and the flow should be regulated with the rate of production so that the main body of the rinse never becomes excessively contaminated with chemical.

Final Rinse - After Passivation

A water rinse (*) may be required following the post treatment. Deionized water is preferred but relatively pure tap water may be used. The paint or powder used and the quality required for the finish part will determine if rinsing is necessary and if deionized water must be used.

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