Metal coating and plastic coating are two mainstream surface‑treatment processes widely used for hardware components, home‑appliance housings, mechanical equipment and plastic products. Though both serve for coloring, protection and corrosion resistance, they show notable differences in adhesion mechanism, pre‑treatment procedures, paint selection, curing temperature and finished‑part performance due to distinct substrate properties. Processes cannot be interchanged; otherwise paint peeling, cracking and poor adhesion are likely to occur.

During long-term service, metal materials are prone to surface rust, peeling, abrasion and scratches due to air oxidation, acid-base medium erosion, mechanical friction and humid outdoor environments. These defects not only damage the appearance and precision of workpieces and reduce the operational stability of equipment, but also greatly shorten service life and increase corporate maintenance and replacement costs. Professional metal surface treatment processes can block corrosive media from the source and strengthen surface hardness, effectively solving the two major industrial problems of metal corrosion and wear, and serving as a core method for long-term protection of industrial equipment.

Many factories face a common dilemma: metal workpieces with qualified base materials and standard processing procedures still suffer from frequent rusting, wear, oxidation and peeling after put into service, resulting in greatly shortened service life. In fact, the poor durability of most metal products stems not from defective base materials, but from substandard metal surface treatment processes. Serving as a protective barrier for metal workpieces, surface treatment directly determines the durability and service life of finished products.

What are the Differences Between Electrostatic Coating and Ordinary Spraying? Which is Better?

Ordinary spraying relies only on air pressure to attach paint mist to workpieces. It can hardly cover dead corners and grooves, leading to uneven coating. Electrostatic coating adopts electrostatic attraction: charged paint mist actively wraps and adheres to grounded workpieces, realizing full coverage without missing spots.

Coating peeling and flaking are common defects for sprayed metal and plastic workpieces, which damage appearance and weaken anti-corrosion performance. Most peeling problems stem from non-standard processing instead of defective coatings, including pretreatment, spraying and curing errors. Targeted solutions can effectively avoid repeated quality failures.

Conventional spraying often causes missing coating, peeling and scratching on hardware and plastic workpieces. As a mature surface coloring technology, electrostatic spraying relies on electrostatic adsorption to realize full-coverage coloring. With standardized pretreatment, it delivers far stronger coating adhesion and durable performance, widely used in mass processing of home appliance parts, chassis shells and plastic structural components.