Welcome to Techlines... March 2007

Powdr₂0

Powdr₂0 has been receiving a lot of attention. As more companies use it, we are able to identify potential problem areas. The Four main areas of concern are:
 

1. Proper blending. The material needs to be initially placed in a blender or a Dispersion blade needs to be used, to properly disperse the powder in the liquid. If it is not properly dispersed it will be clumpy/gritty and can jam in the nozzle or spray unevenly on the substrate.


2. Proper volume of powder to L2O. Use from 48% to 52% by weight of powder to liquid. The actual amount will vary depending on the powder used. If you are getting pin holes you need to add more powder. You will know when you add too much as it will jam the nozzle in the spray unit.


3. Nozzle size. It is recommended that a 2mm or larger nozzle be used. Smaller nozzles will work for some powders, but particle size does vary and using the larger size nozzle will reduce plugging. If you are using too small of a nozzle, the coating will go down too thin and not give a nice smooth finish.


4. Drying prior to baking. The coating needs to be completely dry, or blistering and delamination can occur. Humidity plays an important part in drying. Do not judge simply by appearance. If in doubt place in a vary warm area or place in an over set at about 115F. Do NOT allow the oven to “cycle” as that can expose the drying coating to high enough temperatures to begin the melt and that will trap moisture.

 Number four is where we see the most problems. While the coating cures like electro statically applied powder, it does need to be fully dry first.

Coating Cast Iron Manifolds 

Since cast iron is so porous, it is recommended that a base coat of Cermakrome should be applied prior to the finish coat. This increases the thermal characteristics and really increases the corrosion/rust protection. Cermakrome is the highest rated metallic ceramic and should be used where corrosion is an issue. Apply Cermakrome, bake, lightly blast and top coat. A new base coat for corrosion only is in test. Initial results are very promising. Simply spray or dip, let dry and then top coat with Cast Iron or any of the other ColorGard products. This will save time and money. 

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Send e-mail to the editor: Leonard Warren

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