TURCO® PRETREAT W
HEAT TREAT SCALE INHIBITING COMPOUND
TURCO PRETREAT W is a yellow liquid compound formulated to inhibit the
formation of tenacious scale associated with heat treating of ferrous alloys, stainless
steels, nickel chrome alloys and copper alloys in non-inert gas atmosphere furnaces. It
also minimizes the need for the extremely corrosive acidic mixtures commonly used to
descale heat-treatable alloys. It reduces intergranular oxidation and inhibits the
formation of adherent oxide films.
TURCO PRETREAT W offers these features:
- Shortens descaling time, due to ease of oxide removal
- Very low metal loss (approx. 0.0002 inches per side)
- Minimum equipment requirements
- Minimum intergranular attack or surface etching
Proper precleaning is essential. Many soils, if not completely cleaned from the
metal surface prior to heat treatment, can have very deleterious effects on metal alloys
during the heat treat process. Undesirable alloying on the metal surfaces, often
accompanied by pitting and other serious defects, can result from failure to preclean in
accordance with recommended procedures. Cleaning may be accomplished with TURCO HTC, TURCO
VITRO-KLENE, or other suitable TURCO cleaners. Consult the TDB for the cleaner chosen for
recommendations on operating parameters.
Thoroughly rinse with overflowing water (warm preferred).
Acid clean in appropriate descaling solution for 5 to 10 minutes (See TDB #496 for
recommended procedures). Acid cleaning is not necessary for all conditions, but it is essential
where die contaminants such as lead and zinc, not removable in alkaline precleaning, are
known or suspected to be present.
Rinse with overflowing water for 2 to 3 minutes.
Allow parts to dry.
APPLICATION OF TURCO PRETREAT W:
After thorough cleaning and drying, apply TURCO PRETREAT W compound as soon as possible
to prevent recontamination of metal surfaces.
TURCO PRETREAT W must be thoroughly mixed before using. The best method for application
of PRETREAT W is by spray. No thinning is required. Normal suction aspirated spray
equipment such as Binks Model 18 is satisfactory for application of the thin film
necessary for protection.
* Start with 8 psi Pot Pressure and
increase gradually if more material is required for faster application.
Coating thickness must not exceed 0.2 to 0.3 mils. at any location on the part. Thicker
coatings will not function properly and can lead to part damage. Special caution must be
taken in applying TURCO PRETREAT W to corners or other irregular surfaces. Normally,
application of thin box coatings until a uniform light orange-gold coating color appears
on the surface is sufficient to obtain the recommended thickness.
Under normal atmospheric conditions, drying time is 15 to 20 minutes, after which time
the film is resistant to scuffing and finger-printing. Should it become necessary to
remove TURCO PRETREAT W from metallic surfaces prior to heat treating, immersion in a
TURCO alkaline cleaning solution, such as TURCO HTC, for 10 to 15 minutes will suffice.
PRETREAT W parts must be racked in the heat treat furnace to allow free circulation of
air around each part in order to properly cure the TURCO PRETREAT W coating. Furnace
atmosphere must be slightly oxidizing. A reducing atmosphere prevents proper functioning
of the TURCO PRETREAT W. Note: Interior furnace surfaces must be kept clean.
REMOVING THERMAL OXIDES:
Immerse parts in appropriate TURCO scale removing solution. (See TDB #495 for
recommended procedure, and the proper descaling solution.)
Rinse in cold, overflowing water, 2 to 3 minutes.
Pressure spray rinse to remove lightly adhering oxides which remain on the metal
Dispose of spent solution per local, state and regional regulations.
Refer to TURCO MATERIAL SAFETY DATA SHEET for additional disposal information.
WARNING! Causes eye irritation. May cause skin irritation. Harmful if
Avoid contact with eyes, skin and clothing. Do not take internally. Use
with adequate (equivalent to outdoor ventilation. Avoid prolonged breathing of vapors.
Protective clothing, such as a chemical face shield or goggles and
gloves, made from solvent resistant materials should be worn when handling and using this
product. A NIOSH-approved respirator should be worn when spraying this product in confined
or enclosed areas or during mist conditions.
Transport and store in closed containers at temperatures from 0°to 40°C. Do not store near strong
Before using this product refer to container label and TURCO MATERIAL
SAFETY DATA SHEET for additional precautionary, handling and first aid information.
The above information and recommendations concerning this product are
based upon our laboratory tests and field use experience with this or similar products.
However, since conditions of actual use are beyond our control, any recommendations or
suggestions are made without warranty, express or implied. Manufacturer's and seller's
sole obligation shall be to replace that portion of the product shown to be defective.
Neither shall be liable for any loss, damage, or injury, direct or consequential, arising
out of the use of this product.