Video report and description of using Powder Paint Remover No. 860 to clean a duralumin part protected with anox
(The text is an interpretation of video material)
Once in my career, I faced with a need to apply a powder painting method to aluminum alloy parts. The customer set extremely strict requirements for appearance and thickness of coating. As a result, about a quarter of parts were discarded by the Quality Control Department. The price of parts is several times higher than the price of painting, so the question of powder coating removal came up.
Another problem was that the parts were coated with anox, anodic oxidation over aluminum and aluminum-based alloys which ensures protection against corrosion. Such a coating also provides excellent adhesion for paintwork materials, including powder paints. Moreover, anodizing during galvanic treatment may also be accompanied with painting to give the parts a decorative touch.
Our chemical laboratory tried to make a cleaner, however, anox effect and dimensions were changed, i.e. a part was damaged. The owner of the painting company advised us to use acetone. However, acetone did not give the desired effect: paint actually blistered in 5 days, but it required additional mechanical stimulation. So I turned to the Internet.
Old Paint Remover No.860 manufactured by Mendeleev Ltd. in Saint Petersburg was the most mentioned. I read several feedbacks, there were both positive and negative ones. I took two parts (initially defective), removed anox from the external side with a cutter and painted the both parts completely.
I used INVER paint (made in Italy) for the first part and PRIMATEK (Austria-Russia) – for the second one. Both paints were matt black, color grade according to RAL – 9005. Coating thickness: 0.4 – 0.5 (mm).
Having bought a tester (0.5 l) of Old Paint Remover No. 860 from Mendeleev Ltd., I started a trial. For the illustration purposes, I dipped only half parts into the remover. You can see the complete testing procedure in the attached video. The process starts between the 5th and 7th minute, becomes intensive during the 12th minute and finishes by the 28th – 30rd minute. The result exceeded all my expectations. Powder (powder paint) was removed from both anox and bare metal. Neither anox nor aluminum alloy were damaged, all dimensions remained unchanged and the part was ready for the second painting. The odor is specific but not sharp or bad-smelling. I recommend Old Paint Remover No. 860 to everyone.
Powder Paint Cleaner (Remover) No. 860
Highly-efficient and fast-acting product for cold removal of powder coatings (epoxy-polyester and polyester) from aluminum and steel surfaces using a dipping method. Depending on the type of surface and layer thickness, powder coatings are removed within 30 minutes to 24 hours. In order not to damage plastic parts, protect them when using the product.
1. Designation and benefits: Highly-efficient and fast-acting product for cold removal of powder coatings (epoxy, polyester, epoxy-polyester, polyester, polyurethane, polyacrylate) from any surfaces, other than rubber or plastic, by dipping them into the working solution. Depending on the type of surface and layer thickness, it removes powder coatings within 3 minutes to several hours. In order not to damage plastic parts, protect them when using the product. The composition is a mixture of organic solvents, surfactants and activators and does not contain any halogenated hydrogens. It is a fluid (not jellylike) agent; which penetrates immediately into the powder coating structure and dissolves or destroys it.
2. Application: Immerse the whole parts to be treated into a container with the remover. Close the container with a cover to reduce vaporization of solvents and consumption of Old Paint Remover No. 860. The remover is effective at a temperature below +5°С and does not require any additional heating. After required exposure period, which varies from 3 minutes to several hours depending on the type and thickness of the paint to be removed, the coating becomes either blistered and dissolved or crushed to dust and slowly peels off and sinks out. Take the cleaned part out of the remover, rinse it with running water or flush under pressure (using K?rcher-type high-pressure cleaners) and dry it out. It is preferred to flush parts not just with water but with a FAS-104 technical cleaning and inhibiting solution. The agent protects metal from corrosion and prepares an item for further painting, while increasing the interoperation storage period in the open air under shelter up to 6 months.
3. Consumption: Since the parts to be treated with Powder Paint Remover No. 860 should be dipped into the working solution (see Powdered Paint Remover No. 133 P for application method), the consumption rate depends on the following additional factors along with traditional ones (such as surface layer thickness, type of powder coating, exposure period and temperature):
a) remover usage intensity, i.e. from which area and how long the powder paint is removed;
b) period when the container with paint remover stays open (cover was off);
c) structure of the treated surface (for instance, small-meshed crates) as the parts taken out of the container keep a layer of Old Paint Remover No. 860 due to surface tension.
Subject to average intensity of use and compliance with the manufacturer’s recommendations, one compound can be used up to 1 month.
However, you should perform a few test removals to determine the precise consumption rate. Long-term contact of residuals formed in the course of removal (particles of peeled-off paint) with the working solution leads to its gradual deactivation accompanied with рН decrease to 7 – 8. Deactivation means gradual slowdown of the rate of reaction (increase in the exposure time to coating destruction). So when the cleaning procedure is over, filter the paint residuals from the working solution of Old Paint Remover No. 860 using any available method.
Caution! Do not mix or dissolve Old Paint Remover No. 860 with any other solutions. Dissolved with water, Old Paint Remover No. 860 gets deactivated and cannot be regenerated.
|Color||From colorless to reddish-brown|
|Rheological features||Not consistent|
|Cleaning action, hours, depending on surface (paint type, layer thickness)||From 0.05 to 24|
|Content of active solvents, %, minimum||95|
|Alkali concentration, %, minimum||1|
|Warranty shelf life, minimum, months||24|
|Recommended temperature, °С||+5 – +25|
|Storage conditions, tight container, °С||-5 – +25|
|Corrosion effect on metal||No|
5. Safety precautions
Old Paint Remover No. 860 contains solvents and alkalis. All operations shall be performed in the well-ventilated room using appropriate personal protective equipment. In the event of contact with eyes, rinse thoroughly with running water. In the event of contact with skin, weep with a rag and rinse thoroughly with running water. Consult a doctor if necessary.
Exhausted product hall be disposed as an organic solvent.