Description
VpCI®-377 D is VpCI-377 supplied pre-diluted, so it goes straight to the part with no mixing station. It leaves a dry, clear hydrophobic film for indoor storage, and the 5-gallon pail is the practical size for a basket dip tank at a machining cell or a hand spray pot.
VpCI-377 D exists for shops that want the VpCI-377 result without a mixing station, a DI-water supply or a concentration log. It is VpCI-377 already diluted by Cortec to a working strength: pour it into the dip tank or spray pot and use it. Do not dilute it further, and do not top up a bath with water; top up with more VpCI-377 D. Like the concentrate it is a direct replacement for oil-based rust preventatives indoors, leaving a transparent, dry, hydrophobic film that most coatings can be applied over without removal. In the Cortec Product Consultation Guide VpCI-377 is rated 2 (inside storage) on carbon steel, stainless steel, cast iron, aluminum alloys, galvanized steel, copper, brass and solder; it is not intended for unsheltered outdoor exposure.
Typical applications
- Castings, tubular and finished parts
- Gears, pumps and housings
- Structural steel
- Bars and roll stock
- Small basket dip tanks at a machining cell or inspection station
- Hand-spray protection of machined surfaces before indoor storage
- Parts held between operations or ahead of the paint line
- Field and maintenance crews who cannot mix concentrate on site
How to apply VpCI-377 D
- Surface preparation. SSPC-SP-1: free of grease, oil, corrosion, dirt, dust and mill scale. Parts straight out of a washer running a VpCI-41x cleaner are ideal.
- Mixing. None. VpCI-377 D is ready to use. Stir or roll the container before charging the tank and do not add water.
- Dip. Charge a clean dip tank, submerge the part so recesses and blind holes are wetted, remove and let it dry before packaging or further processing.
- Spray. The solution has a viscosity similar to water and runs in almost any spray equipment. Spray until every critical surface is coated.
- Drying. About 15 to 30 minutes at 70 °F and 50 % relative humidity, as for VpCI-377. Drips can be captured and returned to the tank. Forced air or heat shortens dry time; keep heated drying at or below 175 °F (80 °C) and avoid excessive air flow. Dry completely before packaging.
- Bath control. Because the product is supplied at working strength, take a refractometer reading of fresh VpCI-377 D when you charge the tank and hold the bath at that reading, adding fresh product as it drifts. The pH of the working solution should stay above 8. Cortec’s method for building a site-specific reference chart is on our refractometer and pH charts for every Cortec product page.
- Recoat or paint. Most coatings can be applied over the dry film without removal.
- Removal. Not normally required. When it is, rinse with water and follow with a VpCI-41x cleaner/degreaser to prevent flash rust.
- Storage. Keep the container sealed between uses; the working solution is water-based.
Where it fits in the Cortec line
VpCI-377 D is the convenience version of VpCI-377 concentrate, which is the better buy once a shop is using more than a few pails a month and can run a dip tank on DI water with a refractometer. BioCorr is the other ready-to-use option in the line, biobased and rated for two years indoors, with shorter protection on copper and brass. VpCI-379 is the choice for parts that will be painted over a dry film, and EcoAir VpCI-377 is the same chemistry in a non-flammable compressed-air can for spot touch-up. For outdoor or sheltered storage move to the oil-based VpCI-369. Browse the full Cortec VpCI line.
Field notes
A Pennsylvania locomotive-engine producer ships engines worldwide and stores them outdoors up to two years. VpCI-377 at 20% in the cooling water is cycled through, drained and recaptured, and the recaptured solution is tested for concentration and reused; the program had run almost nine years as of 2019. (Cortec Case History #622)
An Indiana automotive-electrical plant had parts rusting before they left the building. Its replacement three-stage wash runs 5% VpCI-414 with 0.4% defoamer, a water rinse, then 10% VpCI-377 as the final stage; three months of testing showed no corrosion and the process was approved. (Cortec Case History #095)
An Indiana locomotive-engine plant had test water leaving new cooling systems rusting in outdoor storage between build stages, and the residual water had to be freeze-proof. A mix of 20% VpCI-379, 20% glycol and 60% water is circulated, captured, tested and reused; VpCI-379 has been in the company specification since 1999. (Cortec Case History #623)
Specifications
| Protection | Up to 24 months indoors (full-strength VpCI-377 basis) |
|---|---|
| Film | Dry, clear, hydrophobic |
| Chemistry | Nitrite and phosphate ester-free; non-flammable |
| Form | Ready to use; pre-diluted VpCI-377 — do not dilute further |
| Surface preparation | SSPC-SP-1 |
| Application | Dip or spray |
| Dry time | 15–30 minutes at 70 °F, 50% RH; heated drying not above 175 °F (80 °C) |
| Paintable | Most coatings can be applied over the dry film without removal |
| Metals | Carbon steel, stainless steel, cast iron, aluminum, galvanized steel, copper, brass, solder |
| Consultation guide rating | 2 – inside storage (VpCI-377) |
| Removal | Water rinse followed by a VpCI-41x cleaner |
| Size | 5 Gallon Pail |
| Shipping weight | 45 lb (20.4 kg) |
| Availability | In stock |
| Cortec product number | 12000978 |
Solvent Recycling Systems is an authorized Cortec® distributor. See the full Cortec VpCI line, browse the VpCI product selection guide, or contact us for volume pricing and lead times.
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