2019/Oct/15
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Zinc Phosphate Coatings

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Zinc phosphate is preffered in case of requirement of higher corrosion resistance than iron phosphate. It can be used as base for paintings (especially for powder coatings), before cold drawing / cold forming of steel and prior application of protective oil / lubrication.

 

For underpaint zinc phosphate coatings, coating weight varies between 2 - 6 g/m². There is no need of higher coatings weights. Coating weight of zinc phosphate layer before cold drawing / cold deformation operations of steel must be higher relatively, it varies in the range of 5 - 15 g/m². For the coating of iron / steel parts to be treated with oil or wax, coating weight has the maximum level between 15 - 35 g/m².

 

For more detailed technical information;



  PERLI Z4  - Immersion Zinc Phosphate

It is a easy-to-use, liquid one component product, used without any addition of accelerator. Suitable for iron, steel and castings. Provides high corrosion protection before electrostatic powder coating. Zinc phosphate layer weight over the base metal is between 2 - 4 g/m². When used as underpaint coating, it provides high corrosion resistance and excellent paint bonding ability. It deposits thin and acceptable degree of homogenous layer of phosphate coating on the surface, hence there is no need of activation stage before phosphating. Phosphating bath has to be made of stainless steel or polypropylene, these materials are durable against phosphoric acid. 60-70 °C degree of temperature is enough to obtain zinc phosphate coating. Time duration of coating is between 5 - 10 minutes. As a result of phosphate coating sludge accumulation occurs in the bath. It must be decanted periodically.

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  PERLI Z5 - Spray Zinc Phosphate

PERLI Z4 is a spay application liquid product suitable for the pretreatment of iron and steel. The treatment provides 2-3 g/m² of coating that is excellent for bonding of paints and corrosion resistance. There must be an activation stage just before phosphating to make phosphate crystals thinner and compact. Use of accelerator reduces the iron content of the bath that is developed in the course of time. Spray pressure for PHORYL Z S 20 is between 1,0 - 1,6 bar and treatment temperature is between 50 - 60 °C. Time duration of 2 - 3 minutes will be enough for a proper coating. As a result of coating, phosphate sludge piles up at the bottom of the bath and it must be decanted priodically. Phosphating bath has to be made of stainless steel or polypropylene.

 

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PERLI Z5  - Wire Drawing Zinc Phosphate

PERLI Z5 is a zinc phosphate coating process used before cold drawing operation of low carbon steel wires. It is a immersion type product suitable for the wires to be multiple drawn. There is no use of accelerator in this process, therefore iron content of the bath grows in the course of time. After reaching maximum concentration of iron, life of the bath expires and a new phosphate coating bath must be prepared. Wire coils have to be rinsed in activation bath. A separate neutralizing treatment provides extra corrosion resistance along with better soap holding ability. Use of reactive soap is recommended especially while working on wires to be drawn only once. Coating weight varies between 12 - 14 g/m², treating time of 5 - 8 minutes at  60 - 70 °C degree.


 

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PHORYL Z 29 - Heavy Zinc Phosphate

PHORYL Z 29 is a heavy type zinc phosphate coating process composed of two components for the coating of steel, iron and especially castings. Make up and additive chemicals are used separately. The aim of the treatment is to have thicker crystalline coating, so there is no need of activation rinse before phosphating. To obtain a coating weight on the surface between 20 - 35 g/m², temperaure of the treatment solution is rised up to 90 - 95 °C and total acid arranged around 80 ml. Treatment  time can be optimized between 5 - 15 minutes according to bath concentration and temperature. Metal parts that are treated with protective oils after phosphating becomes very resistant aganist corrosion even in very oxidizing contitions.  

 

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