What kind of paint is not easy to fall off when brushing galvanized pipes?

Galvanized pipe. The bottom layer must be done with a zinc yellow primer, remember that it is not a general gray primer, and then the surface is made with fluorocarbon paint.

That's it. Ordinary coatings have poor adhesion to galvanized pipes, cannot play a protective role, and are easy to fall off and lose protection. The traditional phosphate primer and epoxy zinc yellow contain hexavalent chromium.

Ions, which have carcinogenic effects, are inevitably replaced by new products. At present, it is understood that an ED1000 epoxy primer is a high-quality product specially designed for the coating of galvanized pipe materials. This product is not only environmentally friendly and low VOC, but also meets EU standards.

The specific construction methods are as follows:

1) Use matching solvent to wipe the galvanized sheet.

surface, remove oil and grease, prevent adhesion, if there is rust and sand, can be cleaned, no need for overall sandblasting or sanding.

2) Coated with ED1000 epoxy primer, the paint will be with the curing agent.

Mix according to the ratio and add an appropriate amount of diluent.

Stir evenly and spray to achieve the required film thickness.

3) Coating matching topcoat, taking PU800 acrylic polyurethane topcoat as an example, mix the paint and curing agent according to the ratio, add an appropriate amount of diluent, stir evenly, and spray to achieve the required film thickness.

4) Check whether the thickness of the paint film is up to standard, whether the color is uniform and consistent, whether there are problems such as leakage and blistering, and repair it in time after discovery.

Precautions: 1) The ambient temperature is 5-40, and the relative air humidity is not more than 75%.

2) The coating interval of each paint is the surface drying time, and the primer and topcoat coating interval is 24 hours.

3) The primer and topcoat are made of special curing agent and thinner, which cannot be mixed.

4) The mixed paint is used up within 4 hours to avoid gelatinization of the paint.

Technology is advancing with each passing day. In addition to ED1000 epoxy primer. I also learned that a PU1000 (W) bottom surface integrated coating, which is also a paint dedicated to the surface of galvanized pipes, can be used if the anti-corrosion requirements are not particularly high.

One-time coating molding, generally spraying 1-2 can be completed, than ED1000 epoxy primer more construction links.

In the environment with harsh corrosive environment, hot-dip galvanized products will also corrode and rust. In particular, some parts of the hot-dip galvanized layer are weaker and the parts with serious daily wear and tear are more likely to rust in advance.

When hot-dip galvanized structural parts rust, they need to be maintained to extend their service life. A common maintenance method is to use paint. If the following situations occur in the hot-dip galvanized components that have been painted, it means that there is a problem in the selection of paint, and the right paint is not selected!

During the use of the hot-dip galvanized layer, the zinc reacts with the oxygen in the air to form zinc oxide and zinc hydroxide, which adhere to the surface of the component to form a loose coating. At this time, if the general anticorrosive paint is painted, the problem of adhesion will occur in the paint film, and the phenomenon is peeling or bursting.

Hello! The solution to the problem of the galvanized pipe primer not being painted is as follows: in this case, the primer is not used correctly, resulting in the paint falling off.

The galvanized pipe is different from the steel material, the surface is too smooth, most of the paint is not firmly adhered to, and Chunnian is easy to peel off the paint. The surface of the galvanized substrate needs to be painted with a special primer. ED1000 epoxy primer is specially used for galvanized pipes and galvanized sheets, with strong adhesion, no falling off, no paint loss, and can also be used for stainless steel, aluminum alloy and aluminum plate protection.

The paint is resistant to salt spray for 1000 hours and has strong corrosion resistance; The galvanized surface does not need to be polished or sandblasted, and the construction can be carried out after the oil stain is removed; The paint does not contain heavy metals; Brushing or spraying can be done. ED1000 epoxy peel Hu sleepy primer needs to be matched with outdoor weather-resistant topcoat to do tung, through the primer and topcoat multi-layer paint film to protect the substrate, common coating schemes: ED1000 epoxy primer + fluorocarbon paint, ED1000 epoxy primer + acrylic polyurethane topcoat.

A special lacquer, such as a two-component zinc oxide yellow primer, is required.

Galvanized pipes can use "two-component zinc oxide yellow primer" as a primer paint, and galvanized pipes should be polished, which has a certain roughness and is easier to adhere to the paint. The use of epoxy zinc yellow primer also needs to be matched with the corresponding topcoat to achieve double protection.

Epoxy primer can be used for galvanized sheet, stainless steel, aluminum alloy, alloy, steel and other metal substrates, and has strong adhesion to the substrate, the coating does not fall off, the substrate does not need to be sandblasted or sanded, and the surface is scrubbed clean with paint thinner to remove the oil.

Time-saving and labor-saving, the coating has strong salt spray resistance, up to 1000 hours, good corrosion resistance, the coating does not contain heavy metal components, lead-free and chromium-free, and the supporting system is diverse, and can be used with fluorocarbon paint, polyurethane paint, epoxy paint, etc.

Summary. The galvanized pipe is painted according to the following method: the galvanized parts can be phosphated, or a thin layer of phosphate primer can be sprayed first, or the smooth galvanized parts can be sand swept on the surface.

Wipe the surface of the galvanized workpiece and galvanized pipe with solvent (i.e., zinc oxide yellow primer thinner) to remove the protective layer of the workpiece and increase the cleanliness. For two-component zinc oxide yellow primer, the paint is prepared in strict accordance with the ratio of paint and curing agent, and after 30 minutes of curing, the appropriate construction viscosity can be adjusted.

How can the paint on the galvanized pipe not fall off.

The galvanized pipe is painted according to the following method: the galvanized parts can be phosphated, or a thin layer of phosphate primer can be sprayed first, or the smooth galvanized parts can be sand swept on the surface. Wipe the surface of the galvanized workpiece and galvanized pipe with solvent (i.e., zinc oxide yellow primer thinner) to remove the protective layer of the workpiece and increase the cleanliness.

For two-component zinc oxide yellow primer, the paint is prepared in strict accordance with the ratio of paint and curing agent, and after 30 minutes of curing, the appropriate construction viscosity can be adjusted.

The galvanized pipe is primed with a double set of epoxy zinc yellow primer, and it should be painted by hand, and it cannot be rolled with a roller. And when brushing, just brush a layer and then spray the corresponding topcoat on it. At this time, the surface can be sprayed with acrylic polyurethane paint, about 60 microns thick, to achieve double protection.

And before spraying, be sure to phosphate it. According to the phosphoric acid substance, the surface of the galvanized pipe is phosphated, so that the roughness and adhesion of the surface of the galvanized pipe can be improved.

The spraying method of galvanized pipe can be carried out according to the normal spraying construction, and the process of surface treatment-spraying primer-spraying topcoat can be carried out. Use solvents to scrub the surface of the substrate to remove oil and grease, and clean the substrate to ensure adhesion.

Spraying ED1000 epoxy primer to achieve the specified paint film thickness, primer coating after the completion of the interval of 24 hours to coat the topcoat, the topcoat according to the actual use of the selection, indoor environment can choose epoxy topcoat, polyurethane topcoat, outdoor environment can choose acrylic polyurethane topcoat, acrylic topcoat, fluorocarbon topcoat, coating to achieve the specified paint film thickness.

Precautions for galvanized pipe painting.

Using phosphating primer or high adhesion primer, there is now a phosphating primer on the market, which has a similar function to phosphating treatment, which can increase the roughness of the zinc pipe to a certain extent, using phosphating primer and other primers or directly using intermediate paint topcoats.

Before painting the galvanized pipe, it is necessary to polish it, and it is enough to polish it lightly to avoid damaging the anti-corrosion layer of the galvanized pipe itself. The treatment of the substrate and the selection of paint are the key factors to avoid the paint peeling off of the galvanized pipe.

The above content refers to Encyclopedia - galvanized pipe.

Encyclopedia - Spray paint.