Custom color painted metal boxes serve as general protective housings for industrial equipment. They are widely used in communication equipment, new energy control modules, instruments and meters, security electric control units, energy storage assemblies, automation controllers, outdoor electromechanical devices and other applications. The products are fabricated from base materials including cold rolled steel plates, galvanized steel plates and aluminum alloy sheets, finished with customized painting surface treatment. They integrate structural strength, protective performance and aesthetic appearance, and support full-process non-standard customization. They are ideal structural components for various electromechanical equipment to realize shell integration, internal component protection and standardized appearance of complete machines.

　　1. Base Material Selection & Structural Processing Technology

　　We select appropriate metal raw materials according to operating environment, load requirements and installation methods provided by customers. Main available substrates include SPCC cold rolled steel, SGCC hot-dip galvanized steel, AL5052 / AL6061 aluminum alloy sheets, each with distinctive characteristics. Cold rolled steel features excellent formability for bending, welding and hole opening, with balanced cost, suitable for conventional indoor working conditions. Galvanized steel has an inherent anti-rust base layer that slows substrate corrosion and reduces rust risk after coating damage, perfect for semi-open spaces and humid workshops. Aluminum alloy is lightweight with outstanding thermal conductivity and corrosion resistance, applicable to lightweight equipment, outdoor units and electric control modules requiring heat dissipation.

　　Box structures are manufactured with precision sheet metal processes. Production procedures include CNC laser cutting, CNC bending, precision spot welding / full welding, deburring and prefabricated hole machining. We can reserve cable through holes, mounting positions for switches, display windows, heat dissipation louvers, fixing brackets, mounting lugs and guide rail slots as required. Multiple box styles are available: fully sealed enclosures, service boxes with door frames, split upper-and-lower cover housings, wall-mounted metal cabinets, flush-mount shells and desktop control boxes. All welded joints are finely polished to eliminate sharp edges and ensure smooth surfaces after painting without protruding welding marks damaging appearance.

　　External dimensions fully support non-standard customization without limitations of standard specifications. Customers can provide 2D drawings, 3D models, or specify outline dimensions (length, width, depth) and layout requirements of internal components. Our engineering team conducts structural optimization design accordingly. Additional structures such as reinforcing ribs, load-bearing partitions, internal mounting beams, waterproof flanges, lock mounting seats and hinge positions can be added to meet assembly, maintenance, hoisting and fixing demands.

　　2. Custom Color Spraying Technology (Core Advantage)

　　Most standard metal boxes only come in fixed grey or black colors, failing to match the overall color scheme of complete equipment. This product series supports custom color painting of any shade. Color matching can be implemented in accordance with international PANTONE color codes, RAL color codes or physical samples supplied by customers. The consistent appearance between the box and complete equipment improves brand recognition.

　　Electrostatic powder coating is adopted for painting; liquid paint spraying is also available upon request. Strict pre-treatment is carried out before production: degreasing, rust removal and phosphating passivation to eliminate oil stains and oxide layers on plates, forming a base for strong coating adhesion and preventing peeling, detachment and cracking of paint layers. Powder coating thickness is controllable within 60μm～120μm. The finished paint surface features excellent impact resistance, resisting substrate exposure caused by collision during assembly. It delivers good salt spray resistance, humidity aging resistance, and withstands workshop dust, mild chemical vapor and long-term outdoor ultraviolet radiation.

　　Optional surface finishing options: matte coating, glossy coating, fine sand grain coating and orange peel texture coating. Partial masking spraying and two-tone separated spraying are supported. Screen printing and laser marking can be applied to print enterprise LOGO, model parameters and warning signs. For heavy anti-corrosion scenarios, epoxy primer can be added to further enhance rust resistance. If electrical conductivity and electromagnetic shielding are required, we can adjust coating solutions to provide conductive coatings or reserve bare metal contact surfaces.

　　3. Protection Rating & Application Environment Adaptation

　　Different dustproof and waterproof grades can be achieved by assembling sealing rubber strips according to application scenarios. Indoor equipment boxes are equipped with EPDM foam sealing strips to block dust ingress. Outdoor models adopt aging-resistant EPDM sealing components together with bent waterproof grooves, reaching IP54 and IP65 protection levels against splashing rainwater and condensed moisture.

　　The products adapt to various working conditions: indoor control cabinets, laboratory testing instruments, workshop automation modules; outdoor photovoltaic supporting controllers, small energy storage junction boxes, road monitoring power housings; humid-environment water treatment control equipment, aquaculture electromechanical controllers; housings for light-corrosion chemical workshops. Weather-resistant powder is selected for high and low temperature environments to avoid paint fading and chalking caused by repeated temperature cycles.

　　4. Optional Custom Supporting Functions

　　Besides basic housing and color painting, various accessories can be installed in one-stop service:

　　Opening & closing components: stainless steel hinges, concealed hinges, compression locks, plane locks, knob locks and waterproof locks;

　　Sealing accessories: rubber sealing strips, foam strips and waterproof gaskets;

　　Mounting accessories: wall brackets, bottom foot pads, lifting lugs and DIN rail mounting frames;

　　Heat dissipation structures: ventilation holes, louvers, fan mounting holes and dust screen positions;

　　Transparent structures: acrylic windows and tempered glass windows for observing internal instrument data;

　　Extra processing: deburring & polishing, pre-installed grounding bolts, embedded threaded nuts and anti-loose studs.

　　All accessories are designed and processed together with boxes to guarantee precise assembly dimensions. No secondary modification is needed for customers, simplifying assembly procedures of complete equipment.

　　5. Quality Control & Custom Service Procedure

　　Standardized quality inspection nodes are set throughout production: incoming plate thickness testing, first article dimension verification, welding integrity inspection, coating adhesion test, color difference comparison and full visual inspection of finished goods. Color difference is strictly controlled against confirmed samples. Prototypes are produced and delivered for customer confirmation on color, structure and hole layout before mass production to avoid color deviation and dimensional errors.

　　Standard service workflow: demand communication → drawing & sample collection → engineering evaluation → prototype manufacturing → sample confirmation → mass production → factory inspection → packaging & delivery. We support small-batch trial orders and stable supply for large-volume orders, capable of matching long-term supporting demands of foreign trade merchants and equipment manufacturers with reliable lead time. Products are packed with pearl cotton, cartons and wooden frames to prevent paint scratches and box deformation during transportation.

　　6. Application Fields

　　Custom color painted metal boxes are widely applied to: new energy energy storage equipment, photovoltaic inverter housings, lithium battery control boxes, industrial PLC control cabinets, testing instrument enclosures, auxiliary medical equipment shells, security power boxes, IoT gateway housings, small rail transit electric control boxes, intelligent agricultural equipment controllers, air compressor control units and communication signal conversion equipment. Harmonized appearance colors help equipment manufacturers build complete product portfolios, standing out from generic grey standard cabinets and boosting market competitiveness of end products.

　　Benefiting from flexible structural customization, precise color matching spraying technology and stable sheet metal processing quality, custom color painted metal boxes become preferred housing solutions for numerous equipment manufacturers. We continuously optimize sheet metal forming and surface spraying processes, balancing structural practicality, corrosion durability and visual aesthetics, providing one-stop metal enclosure customization solutions for customers worldwide.