When preparing bare and galvanized steel substrates, it is important to follow proper surface preparation and priming recommendations to ensure good adhesion and corrosion protection. This standard operating procedure (SOP) covers surface preparation of bare and galvanized steel. Before beginning any repair, it is important to always wear the recommended safety protection required for the job.
----------
PD-0115S: METAL SURFACE PREP - BARE & GALVINIZED STEEL
----------
To ensure proper corrosion protection and adhesion, specific steps MUST be followed when preparing and priming bare aluminum substrates. These procedures apply to a damaged painted OEM panel or an e-coated OEM replacement panel.
1. Clean entire part:
a. Use an approved solvent-based wax and grease remover (check local regulations) and a clean towel. Dry thoroughly.
b. Follow with waterborne pre-cleaner and a clean towel. Dry thoroughly.
2. Inspect part for imperfections and damage. Determine what repairs should be made if any (follow all process documents for repairs made to the part.)
3. Prepare bare steel areas-after making any necessary repairs, sand exposed steel using a DA sander with 120-180 grit sandpaper and interface pad. Re-clean entire part. Spot prime bare steel areas as outlined below in Step 4A or 4B.
IMPORTANT: to avoid galvanic corrosion, never use the same piece of sandpaper on both steel and aluminum. Avoid cross contamination of airborne steel and aluminum particles generated in the same shop areas.
***Prime bare steel substrates immediately.***
IMPORTANT: oxidation can form on exposed steel surfaces in as little as 15 minutes! If necessary, scuff and re-sand prior to priming.
4-A** Etch Primer followed by surfacer or sealer and PPG topcoat system (refer to PD-0705WB or PD-0705SB).
IMPORTANT: do NOT apply epoxy primer, body filler, or topcoat directly over etch primer.
4-B** Epoxy Primer followed by body filler, surfacer, sealer and PPG topcoat system (refer to PD-0705WB or PD-0705SB).
NOTES: To prevent dissimilar metal corrosion where bare metals make contact with one another (bolts, rivets, hinges, etc.), ECK® (Electrolysis Corrosion Kontrol) should be applied. Refer to ECKPB01 for details.
**Refer to individual product sheets for complete mixing and application procedures and approved product systems.
27 авг 2024
