Immersion Route
Immersion is the standard route. Alkaline degreasing is used for immersion work and for high-silicon castings. No agitation or stirring is needed in the bath; parts can hang still on the rack.
Aluminum conversion chemistry built around trivalent chromium passivation, which leaves a trivalent chromium conversion coating on aluminum and its alloys.
Fengfan AL-100 Aluminum Alloy Trivalent Chromium Passivator is a concentrated passivator for aluminum and aluminum alloys. It is diluted with deionized water and reacts with a clean aluminum surface to form a clear aluminum conversion coating in seconds to a few minutes, depending on line operation. Nothing is electrodeposited: the film grows out of the metal itself and follows the profile of the part rather than sitting on top.
The product replaces the step commonly known as an “alodine coating.” Its trivalent chromium chemistry contains no hexavalent chromium. It is not an anodized coating; it forms by chemical reaction, not electrolytically, and leaves the surface looking like aluminum rather than coated aluminum. It can be run immediately before paint, powder coating, or adhesive bonding, or as the last tank of the day.
AL-100 can be applied at the end of an aluminum anodizing process or as a stand-alone tank on bare extrusion and castings. It is kept as a separate tank from an anodizing line because the two processes do not share chemistry.
These are the published working ranges for the AL-100 bath. Start at the standard figure rather than the top of the range.
| Parameter | Range |
|---|---|
| Concentration, spray | 100–500 ml/L |
| Concentration, immersion | 100–500 ml/L |
| Temperature | 30–40 °C |
| pH | 3.7–3.95 |
| Time, spray | 30–60 s as coating pretreatment at 40 °C; 1–3 min as corrosion treatment |
| Time, immersion | 1–4 min as coating pretreatment at 30 °C; 2–6 min as corrosion treatment |
| Spray pressure | 0.5–1.5 bar |
| Stirring | Not necessary |
| Bath material | Stainless steel, or steel with an acid- and fluoride-resistant lining |
| Filtration | As required, at least 2 bath turnovers per hour |
| Heating | As required, with acid- and fluoride-resistant heating equipment |
| Cooling | Not necessary |
| Exhaust | Recommended, for worker health |
AL-100 supports both routes with the same drum, so a shop can start on immersion and add spray later without changing chemistry.
Immersion is the standard route. Alkaline degreasing is used for immersion work and for high-silicon castings. No agitation or stirring is needed in the bath; parts can hang still on the rack.
Spray is an alternative for parts that are awkward to dip, including long extrusions, wide panels, and bulky assemblies on a conveyor. No bath agitation is needed; a reservoir, pump, and nozzle set are sufficient. Short spray contact times fit inside a paint or powder line without slowing it.
Use alkaline degreasing for immersion work and high-silicon castings. Use acidic degreasing on a spray line. High-silicon alloys—most die-cast and many foundry grades—take the alkaline route rather than acidic preparation.
Need to match the route to your tank, rack, or conveyor line?
AL-100 is used where a clear chemical film must support a following coating or leave the part ready for the next step.
The published sequence is simple: Degrease → Rinse → Passivate → Rinse and dry → Coat or leave.
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View productIt is a concentrated trivalent chromium passivator for aluminum and aluminum alloys. it reacts with a clean aluminum surface to form a clear aluminum conversion coating, and it can be used before paint, powder coating, or adhesive bonding, or as the last tank of the day.
No. it is not an anodized coating. the film forms by chemical reaction, not electrolytically, and leaves the surface looking like aluminum rather than coated aluminum.
No. stirring is not necessary in the bath, and parts can hang still on the rack. on a spray route, no bath agitation is needed; a reservoir, pump, and nozzle set are sufficient.
Concentration is 100–500 ml/l for both spray and immersion; temperature is 30–40 °c; ph is 3.7–3.95; spray pressure is 0.5–1.5 bar. time depends on route and use, with spray 30–60 s as coating pretreatment at 40 °c or 1–3 min as corrosion treatment, and immersion 1–4 min as coating pretreatment at 30 °c or 2–6 min as corrosion treatment.
Clean new tanks or lines with 10% sulfuric acid solution, rinse thoroughly with water, add measured al-100 plus deionized water, stir until evenly mixed, measure ph and adjust to 3.9. use deionized water rather than tap water.
Standard start-up values are 250 ml/l spray concentration, 200 ml/l immersion concentration, ph 3.9 checked with a meter, and 1 bar spray pressure. confirm the standard against a panel from your own line before the first production batch.
