3M Aerospace Sealant AC-131 BB Surface Pre-Treatment
A water based surface pre-treatment used to enhance adhesion between organic coatings and metallic surfaces. Works extremely well on aluminum, nickel, stainless steel, magnesium and titanium alloys.
Use InstructionsSurface Preparation
AC-131 may be applied after cleaning to a "water-break free" surface. Alkaline cleaning will usually provide a "water-break free" surface. Chemical etching and deoxidizing is generally not required. Manual deoxidation can be accomplished by either Scotch Brite pad abrasion or sanding with #180 grit or finer Aluminum Oxide sandpaper.
NOTE: It may be necessary to deoxidize prior to applying AC-131 if a water-break-free surface is not achieved by the cleaning process.
Application rate is approximately 1 quart of AC-131 for approximately 200 ft-squared of surface to be coated.
AC-131 coating solution can be sprayed onto the part surface using a variety of methords including HVLP guns, hand pump sprayers, etc. The solution is applied so as to completely wet the part surface with a mist. Excess solution may run off the part. Larger surface areas may require coating by sections.
Apply fresh AC-131 by brushing with a clean natural bristle brush or swabbing with a clean wiper, sheesecloth or gauze. Do not scrub with a brush or application. Apply solution to achieve complete coverage of surface to be treated. Brushes or wipers should not leave streaks on the surface.
Allow coated part to drain for 3 to 10 minutes. If there is any surplus AC-131 solution that has pooled or collected in crevices, pockets, or other collection areas, including drip edges or fastener holes, use filtered compressed air to blow off excess solution. Do not splatter this excess solution onto adjoining part surfaces. Alternatively a cloth pre-wetted with AC-131 may be used to gently blot, not rub, the surface of pooled solution. Do not blow dry areas of the part that are able to freely drain.
Dry/Cure of AC-131
Dry the solution-coated parts under ambient conditions for a minimum of 60 minutes. Minimize contact with the part while drying. Exact drying time will vary depending upon part configuration of the part and ambient conditions. Alternately, after drying at ambient temperature for a minimum of 30 minutes parts may be heated to 140 degress F maximum for an additional 30 minutes minimum to facilitate drying. After drying, coated surfaces should be protected from contamination prior to applying the epoxy-based or polyurethane-based organic coating.
How It Works
A Sol-Gel preparation, AC-131 promotes enhanced adhesion as a result of the chemical interaction at the interfaces between the metal and the AC-131 and the AC-131 and the primer.
Time savings: Reduction in process flow time comparing traditional conversion coatings methods yields a minimum of a 35% reduction in labor-time.
Enables Lean Manufacturing and Work Cell Manufacturing concepts, reducing cycle times.
Hazardous materials: Elimination of hazardous chromate materials. Hazardous rinse water and waste water containment systems area eliminated.
Minimal waste water associated with application of AC-131 as there is no rinsing.
Health & Safety Precautions
After using this product, to prevent ingestion, always wash your hands before eating or smoking. Read the Material Safety Data Sheet for more information.
The shelf life of AC-131 2-part configuration is 12 months from the date of manufacture when stored in the original unopened containers between 40 degrees Fahrenheit and 100 degress Fahrenheit.