CONDURSAL 777i Instructions For Use:
Application:
Before applying, stir the contents of Condursal 777i can well. As received, Condursal 777i is suitable for application by painting.
Prior to applying the paste, the surface of the components must be cleaned thoroughly by either a vapor degreaser or detergent washer, so they are free of oil and grease.
Painting:
Soak the brush thoroughly in Condursal 777i. Paint the areas to be protected as evenly as possible. If the steel can be seen through after coating, a second layer is recommended. Drying time between two coatings should be at least one half hour.
Spraying:
Use spraying pistols with a beaker on top. Supplying the paste by gravity. Do not use spraying pistols attached to a pressurized container or airless spraying equipment.
Spray as evenly as possible to a thickness of approx. 0.2 to 0.3 mm (.006” to .010”). As mentioned above, normally one coating is necessary for effective protection.
Recommended diameter of nozzles is 1.5 to 2.5 mm (.060” to .100”). If necessary for better spray ability, small amounts (less than 5%) of tap water can be added.
After coating the parts should be allowed to air dry for 2 to 3 hours before carburizing.
Condursal 777i can also be applied by immersion or using dispensing equipment.
Notes:
- The coated areas of the work pieces should not exceed 30% of the total surface of the load because otherwise the furnace atmosphere might be affected.
- The coated parts should be placed in the batch in such a manner that they cannot come into contact because otherwise insulation defects on the coated areas and undue insulation on non-coated areas might occur.
During use, with the can open, Condursal 777i has a tendency to thicken due to evaporation of the liquid vehicle in the paint. Adding small amounts of tap water can restore normal consistency. Be aware that over thinning will impair the effectiveness of the paint.
Removal of Residues:
Removal of residues after heat treatment
After carburizing and quenching, residues of Condursal 888 can easily be removed just by washing with hot water or alkaline.
Cleaning of brushes and other equipment:
Immediately after use Condursal 777i cans should be tightly resealed and the pistols, tubes, etc. cleaned with water. If spraying is interrupted for any length of time, the pistols should be set in water to prevent drying. Deposits as well as contents of the can cannot be rejuvenated of the liquid vehicle if the paste becomes dry.
Storage:
Condursal 777i should be stored in a dry, cool place. Shelf life is approximately 12 months. Condursal 777i is based on water and must therefore be prevented from freezing.
Trouble Shooting Preface:
Condursal 777i is as easily applied as an oil based paint. As with all painting, it is important to clean and degrease the surfaces to be coated thoroughly. A soft bristle brush should be used to insure a uniform coating thickness. Allow the coating to dry thoroughly before the work piece is put into the furnace. The following list is provided to address possible causes on ineffective stop-off of this paint.
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Paint runs off after applying by painting, spraying or immersion.
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1. Paint has been stored at too high temperatures.
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Store paint at ambient temperature.
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2. Work pieces have not been de-greased thoroughly prior to coating.
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Clean parts thoroughly by vapor degreasing or alkaline washing.
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3. Paint has been thinned excessively.
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Use paint as delivered after homogenizing the content of the bottle/bucket; add small amounts of water only if thickening has occurred.
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4. Paint has been applied in too thick a coating.
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Apply paint in a thin coating of uniform thickness; if necessary for deep cases, apply twice.
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Paint pops off after drying.
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1. Surfaces of work pieces were wet or greasy when paint was applied.
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Clean parts thoroughly by vapor degreasing or alkaline washing and make sure that they are dry prior to coating.
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Paint runs off in the carburizing furnace.
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1. Paint has been applied in too thick layer/coating has not been allowed to dry thoroughly.
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Apply paste in a thin coating of uniform thickness and let dry thoroughly.
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2. The organic binder of the paint has burnt because parts have been preheated at temperatures of more than 390 degrees F. with oxygen present.
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Limit preheating temperatures to 390 degrees F. max.
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3. Coating has come into contact with oxygen in the carburizing furnace due to incorrect atmosphere regulation or cracking/leaking of the retort of the furnace.
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Make sure by purging with nitrogen that even in the beginning of the carburizing process, furnace atmosphere does not contain oxygen/repair retort.
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Residues of the paint are hard to remove after carburizing/ surface attack is noted.
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1. Coated parts have been cooled down after carburizing and then reheated for quenching.
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Remove residues of the paste after carburizing.
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2. Paint has not been stirred thoroughly prior to use.
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Stir paste thoroughly prior to use.
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Protection against carbon pickup has been found to be non-uniform or non-satisfactory.
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Paint has been applied in a too thin or non-uniform layer.
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Apply paint in a layer of even thickness; if necessary for deeper cases, apply twice but keep in mind the first coat must be dry prior to application of a second one.
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