PHOSPHATE CONVERSION COATINGS

 

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IRON PHOSPHATING

Iron phosphating is the most preferred conversion coating  method for indoor equipments due to its advantage of low first investment cost and unit prices of the chemicals. Iron phosphate coating chemicals are easy to use products that can be used by wiping, spraying or dipping for the metal surfaces do not require high corrosion resistance.

 

IRON PHOSPHATE CONVERSION COATING BY APPLICATIONS;

Iron phosphate coating ranges in color light yellow to blue-red. Coating weight is generally between 0.2 - 1.0 gr/m2. Concentration of the coating solution varies in the range of %1 – 10 and operating temperature is between room temperature – 65 °C. Optimum pH value of phosphating solution is 4 to  6. Below pH 4 dusty coating may occur and above pH 6 coating may be loose and unsatisfactory.

 

Hence iron phosphate coating is not a thick coating relatively, passivation and drying stages should be operated carefully. When outbreak of oxidation (rust) is observed after the treatment, this indicates insufficient coating on the metal surface. Iron phosphate coated but unpainted metal workpieces do not have improved corrosion protection, that’s why it is an advantage to paint the phosphated surface immediately after phosphating.

 

Iron phosphating increases paint adherence and impact resistance along with improved flexibility. Treated metal surface has the ability to stop progress of oxidation underneath the paint when damaged by an external impact.

 

However iron phosphating suitable for ferrous metals, by the advantage of surfactant content, it can also be employed in cleaning and etching of aluminium or galvanized metals.

 

When iron phosphating applied by spraying, phosphating and degreasing can be operate at the same stage with proper quantity of both chemicals.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 
 


 

 

 

 

 

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