Surface Finishing

Surface Finishing is a process that uses physical or chemical treatments on the outer surface of metals or other materials to alter their appearance, enhance their functionality (e.g., corrosion resistance, wear resistance, conductivity), or strengthen material properties. It is a vital step for a product's final texture, durability, and precision.

• Preventing Corrosion and Oxidation: Extends the lifespan of metal products.
• Enhancing Appearance: Increases commercial appeal.
• Strengthening Mechanical Properties: Improves hardness and wear resistance.
• Conductive/Insulating Functionality: Critical for electronic and electrical components.
• Improving Mating Performance: Reduces friction and improves assembly efficiency.

This process uses an electric current to deposit metal ions onto a workpiece's surface. Common platings include nickel, chrome, zinc, gold, and silver.

Applications: Tool parts, electronic contacts, automotive and motorcycle hardware.
Advantages: Shiny appearance, rust prevention, improved wear resistance.
Important Note: Requires control over current density and solution purity.

Primarily used for aluminum and aluminum alloys, this electrolytic process forms a protective oxide layer on the surface for protection and coloring.

Applications: Bicycle parts, consumer electronics casings, precision modules.
Advantages: Increased hardness, can be colored, excellent corrosion resistance.
Related Techniques: Hard anodizing, color anodizing.

A process of applying powder or liquid coating to the workpiece surface, which is then heated and baked to form a film.

Applications: Appliance casings, bicycles, display racks.
Advantages: Wide range of colors, scratch-resistant, provides insulation.
Important Note: Requires thorough degreasing and rust removal, along with uniform application techniques.

A chemical process that creates a black oxide layer on the surface, improving rust resistance and oil absorption. It is mostly used for carbon steel parts.

Applications: Tool heads, hand tool components, mechanical parts.
Advantages: Simple processing, does not affect dimensions.
Disadvantages: Limited surface hardness, often requires a protective anti-rust oil.

Purely physical processes that use sandpaper or polishing paste to create fine textures or a mirror-like finish on the surface.

Applications: High-end hardware, precision panels, consumer electronics.
Features: Highly decorative, but susceptible to fingerprints and scratches.

Uses high-speed particles to impact the surface, removing scale, cleaning the surface, and increasing adhesion.

Applications: Pre-treatment for electroplating, aerospace parts, device casings.
Advantages: Increases surface roughness and improves coating adhesion.

HIROKI integrates its own stamping with post-processing operations. This allows raw parts to go directly to the surface finishing stage, reducing logistics and delivery risks. It is especially suitable for clients with small-to-medium volumes and high variability needs.

We offer services including electroplating, anodizing, powder coating, black oxide, sandblasting, brushing, and polishing. We collaborate with specialized partners to match the most suitable process to a product’s specific characteristics.

Pre-treatment: High-pressure degreasing, acid pickling, phosphating, etc.
During Application: Applying powder/paint uniformly in a controlled temperature and humidity environment.
Post-application: Testing for film thickness, adhesion, and salt spray resistance.

Automotive fasteners, brake calipers, and brackets are exposed to rain and oil, and often require zinc-nickel electroplating, black oxide, and powder coating. HIROKI has manufactured brake suspension structures for OEM clients and provided zinc layers with 720-hour salt spray resistance.

Casings, handles, and metal fasteners need to be wear-resistant and rust-proof. Powder coating and anodizing are common choices. HIROKI provides scratch-resistant color powder coating solutions for power screwdrivers and wire stripping machine housings.

These products demand lightweight, aesthetic, and weather-resistant properties. Colored anodizing on aluminum alloys is the mainstream choice. HIROKI combines polishing and brushing with hard anodizing to enhance both appearance and scratch resistance.

Device casings often require a brushed or glossy polished finish. HIROKI has the capability for fine grinding and mirror polishing to meet the demands for high-end metal textures.

We use a film thickness gauge to measure coating thickness, ensuring it meets client-specified requirements (e.g., 5~25μm), and check for overall uniformity and adhesion.

Cross-Cut Test: Confirms coating adhesion.
Salt Spray Test: Simulates a corrosive environment, with standard resistance lasting from 120 to 720 hours.

We use gloss meters, colorimeters, and control samples to ensure accurate color for every batch, performing full or sampling inspections as required by the client.

This eliminates communication risks with multiple vendors and allows for complete control from design drawings to final packaging.

During the die design phase, HIROKI considers the finishing direction and potential "shadow" areas for coating, ensuring a uniform appearance without blemishes.

We have successfully served over 50 brands in the electronics, tools, bicycle, and automotive industries.