Common Anti-corrosion Architectural Coatings for Square Tubes

What is a square tube?

Square tube refers to a steel tube with equal side lengths that is rolled by strip steel. Generally, the strip is unpacked, flattened, crimped, welded to form a round tube, and then rolled into a square tube from the round tube and then cut. Cut to desired length. Most of the square pipes are steel pipes, mostly structural square pipes, decorative square pipes, construction square pipes, etc.

What are the common anti-corrosion architectural coatings for square pipes?

1. Bitumen

Bitumen anti-corrosion architectural coatings, raw materials are easy to obtain, high quality and low price, can resist the erosion of dilute caustic soda solution and dilute alkali at room temperature. The paint layer has good ductility and fast drying, and is commonly used for ground waterproofing. But bitumen architectural coatings are not resistant to a variety of organic solutions and oxidizing agents, and are subject to ultra-low temperature aging. The current shaping products, such as medium temperature coal tar enamel, crude epoxy zinc-rich primer, epoxy resin asphalt cement, are all epoxy zinc-rich primers of modified materials, the purpose is to better improve the high paint layer of the square tube strength, heat resistance, aging resistance and adhesion.

2. Polyurethane material

Polyurethane paint is resistant to acid, alkali, acid and alkali, moisture and wear resistance. As an anti-corrosion architectural coating, it is mainly a one-component wet-dry-curing type, a two-component metal catalyst dry-curing type and a methyl-based dry-curing type. In order to better improve some characteristics, it is often mixed with epoxy resin glue, bitumen, etc.

3. Styrene epoxy resin

Styrene paint is a good architectural coating, which has been widely used in chemical plant to prevent chemical plant air corrosion. Its defect is poor adhesion. In order to better improve its adhesion, epoxy resin adhesive modified materials are commonly used to obtain certain practical results.

4. Zinc-rich architectural coatings

The basic principle of anti-corrosion of zinc-rich architectural coatings is that zinc powder can have the effect of cathodic protection of pipelines on steel raw materials, so it can be used for anti-corrosion of strong electrolytes, sea surface, oil and deep sea air. Not suitable for use in acid and alkali substances.

5. Chlorosulfonated high pressure polyethylene

Chlorosulfonated high pressure polyethylene architectural coatings have extraordinary resistance to active oxygen, weather embrittlement, high-quality acid and alkali resistance, wear resistance, and corrosion resistance to strong alkali, strong acid, carbonate and other organic chemicals. Good, and make the square tube have the physical properties of flexibility, wear resistance, impact resistance, high temperature resistance, cold resistance, flame retardancy, anti-positive ion radiation source, good adhesion and other process properties.

6. Epoxy resin glue

It has the advantages of strong adhesion, acid and alkali resistance, and poor shrinkage rate, so it is widely used for anti-corrosion of inner and outer walls of pipelines. The disadvantage is that the aging resistance is poor, and the paint layer is easy to delaminate. Especially when the dry-solid solution is not good, the wear resistance of the coating layer is poor, and the film is prone to whitening and brittleness.