LW-29 is a kind of environmental protection acid treatment additive. It applies the composite metal salts to form the uniform chemical conversion film on aluminum surface which can effectively enhance the coating film adhesion and corrosion resistance to the surface and the coating. LW-29 is chromium-free and in line with the green environmental protection requirements, can completely replace the traditional chromium passivation coating for aluminum surface treatment,it can also be used to spray or immersion.
| Bath Make-up： | ||
|---|---|---|
| Name | Quantity | Unit |
| LW-29 | 8 | g/L |
| Running Water | Balance | |
| Operating Conditions： | ||
| Name | Quantity | Unit |
Temperature | Room Temperature | |
PH | 3.4-5.5 | |
Conductivity | 50-180 | μs/cm |
| Time | 1-3 | min |
| Process Control： | ||
| Process flow : Rinsing → Degreasing → Rinsing → Rinsing → Rinsing → Passivation → xRinsing → Dry | ||
| Solution Maintenance： | ||
| After a period of production, LW-29 should be replenished in time for the passivation performance of solution will get down caused by the content decreasing; The PH of solution is the key factor to affect the quality of coating film, when PH goes too high resulting in very slow coating film forming speed, please replenish LW-29 and mix evenly, then solution can be used normally again. | ||
| Packaging and Storage: | ||
| Package: Plastic barrel (25kg/barrel) | ||
| Storage: Suggested to store in cool, dry and well ventilated place; away from fire and heat source. | ||
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