Commonly used construction methods of steel structure coatings

Construction method

Characteristics of applicable coatings

Coated object

Use tools or equipment

Main advantages and disadvantages

Drying speed

Viscosity

Variety

Brush method

Slower drying

Low plasticity

Oil paint

Phenolic paint

Alkyd paint, etc.

General components and buildings, various equipment pipes, etc.

Various brushes

The investment is small, the construction method is simple, and it is suitable for coating of various shapes and sizes; the disadvantage is that the decoration is poor and the construction efficiency is low

Manual roll coating

Slower drying

Low plasticity

Oil paint

Phenolic paint

Alkyd paint, etc.

General large-scale plane components and management, etc.

Roller

Low investment, simple construction method, suitable for painting large areas; the disadvantages are the same as brushing method

Dip coating

Proper dryness, good leveling, moderate drying speed

Good thixotropy

Various synthetic resin coatings

Small parts, equipment and mechanical parts

Dipping tank, centrifugal and vacuum equipment

The equipment investment is less, the construction method is simple, the paint loss is less, and it is suitable for the construction of complex components; the disadvantage is that the leveling is not good, there is sagging, pollution, and the solvent is easy to volatilize

Air spray

Fast evaporating and moderate drying

Low viscosity

All kinds of nitrocellulose paint, rubber paint, architectural vinyl paint, polyurethane paint, etc.

Various large components and equipment and pipelines

Spray gun, air compressor, oil-water separator, etc.

The equipment investment is small, the construction method is more complicated, and the construction efficiency is higher than the painting method; the disadvantage is that the consumption amount is large, the pollution phenomenon is easy to cause a fire

Mist spraying

Coatings with only high boiling point solvents

High non-volatile content, thixotropic

Prototype coatings and high non-volatile coatings

Various large steel structures, bridges, pipelines, vehicles and ships, etc.

High pressure airless spray gun, air compressor, etc.

The equipment investment is large, the construction method is more complicated, the efficiency is higher than that of the air spray method, and the thick coating can be obtained; the disadvantage is that part of the coating is also lost, and the decoration is poor