Trivalent Chromium (Hex-free)

SUNGJINLOGIS operates a Hex-free trivalent chromium process with an integrated passivation system to meet both regulatory compliance and demanding corrosion / appearance requirements.

Hex-free Trivalent Chromium Process

Uses trivalent chromium without hexavalent chromium, supporting environmental compliance while maintaining stable cosmetic quality.

TriMac Blue + Tristar Shield

Links trivalent chromium plating (TriMac Blue) with passivation (Tristar Shield) to enhance corrosion resistance and appearance uniformity.

Dedicated Rectifier Operation (MUNK)

Operates with a dedicated rectifier (MUNK, Germany) to control current quality and process repeatability.

Control Points

Key control items for appearance and corrosion performance in trivalent chromium.

• Maintain target bath conditions (concentration/temperature/pH) to minimize color and gloss variation

• Control current and voltage (including waveform) to stabilize deposition and ensure appearance uniformity

• Standardize passivation parameters (time/concentration/agitation) to achieve corrosion resistance

• Manage rinsing and drag-out to reduce contamination entry and bath fluctuation risk

• Reduce data variation through periodic sampling at standardized locations (repeatability-focused control)

• Keep line conditions stable through defined equipment checks (circulation/filtration/replenishment)

Verification Evidence

We build process confidence through measurable data and systems.

• In-house evaluation of thickness, appearance, and adhesion with data-based history tracking

• Support for reliability testing requirements such as salt spray (including CASS when required)

• Documented process control and traceability to meet eco-compliance / Hex-free requirements

• Process control aligned with quality systems (SQ/ISO, etc.) and customer requirements

Typical Applications

Applied to product groups with strict compliance, appearance, and corrosion-performance requirements.

• Automotive interior / decorative trims with high appearance and corrosion-resistance requirements

• Mobile and electronics decorative parts (brackets/deco) requiring high surface quality

• Product groups where customer compliance requirements (Hex-free) are mandatory

Equipment Photos

Example equipment for trivalent chromium, passivation, and rectification.

Trivalent chromium plating tank (Trivalent Chromium / TriMac Blue) — Trivalent Chromium (TriMac Blue) Tank

Passivation equipment (Tristar Shield) — Passivation System (Tristar Shield)

Dedicated rectifier: MUNK (Germany) — Dedicated Rectifier: MUNK (Germany)