One article to understand construction machinery coating matching and technology

Paint spraying is a relatively common process for anti-corrosion protection of construction machinery.
The coatings used in construction machinery mainly include primer, midcoat, topcoat, paint resistant, high temperature paint, moisture resistant paint, etc.
The primer is a coating that directly contacts the substrate and plays a role in the entire coating structure.
Very important role.
Suzhou Jiren High-tech Materials Co.
, Ltd.
's construction machinery coating supporting plan and construction process are as follows:

Before construction, all defective weld beads on the surface of the steel structure should be re-welded and processed to an acceptable appearance.
The temporary welds and supports left after the structural aids are removed from the base metal should be polished and smoothed.
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Before sandblasting and painting, sharp edges and all rough cut edges should be polished to a radius of at least 2mm.
All visible burrs, bumps, welding slag and spatter on the weld must be removed.
Secondly, perform surface pretreatment to detect the presence of hydrocarbons and other pollutants on the surface.
If there are, remove them with alkaline cleaning agents.
Clean them with low-pressure fresh water before drying, or use solvents to remove oil and grease pollution.
Contaminant-free areas need to be cleaned with low-pressure fresh water to reduce the content of chloride ions.
Carbon steel blast cleaned to GB 8923 Sa2.
5.
After the surface pretreatment is completed, the substrate surface is cleaned by abrasive blasting to Sa2.
5 (GB 8923) to obtain a sharp and rough surface profile, and the roughness should meet 30-85 microns.
The surface of the steel to be painted after sandblasting should be clean, dry, and grease-free, and maintain roughness and cleanliness until the first paint spray; all dust must be thoroughly cleaned, and the amount of dust (size, quantity) must be less than level 2.
Standard for dust cleanliness on the surface of steel plate after sandblasting

The coating method can be brushing, rolling and spraying.
Brushing is usually carried out in three steps: coating, smoothing, and repairing, and the three steps are continuous.
Brushing tracks should be crisscrossed to avoid missing coating or uneven thickness.
Brushing should ensure proper paint viscosity, ensure that it is finished within the paint mixing time, and avoid serious brush marks, paint brush lint, etc.
The film is formed by brushing once, and multiple constructions are required to achieve the specified film thickness.

According to different substrates, choose suitable rollers for roller coating.

Spraying mainly includes air spraying and airless spraying.

During the coating process, if the paint film does not completely cover the substrate, including but not limited to missing spray, insufficient film thickness, color and gloss problems, and poor hiding power, these defects can be repaired by spraying a new coating; if dry Spraying (overspraying) and rough appearance or sagging and dripping.