Matte Tin
Matt tin plating is the premier functional finishing choice for high-reliability electronic components. Compared with bright tin, it offers better solderability retention, anti-whisker stability and mechanical contact performance. It is widely used in automotive terminals, PCB connectors, precision switches, sensor pins and long-shelf-life electronic parts.
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Standard Bath Formula & Composition Characteristics
Industrial matt tin plating primarily uses a stable acidic sulfur-based electrolyte system (sulfuric acid tin plating), which is low-stress, high-purity and ideal for functional electronic plating.
Major Bath Components
• Main Metal Salt (Stannous Sulfate) Provides high-purity divalent tin ions for deposition. Produces 99.9% pure tin coating with minimal metallic impurities, ensuring excellent solderability and electrical conductivity.
• Base Acid (Sulfuric Acid) Maintains strong acidic conductivity, stabilizes tin ion solubility, prevents tin hydrolysis and oxidation, and improves current efficiency across the entire working current range.
• Grain Refining Additives (Key Matt Agent) Proprietary non-bright organic polymers and surfactants serve as core matt agents. These additives control crystal growth rate, suppress large grain formation, and create microscopically uneven surface morphology that eliminates light reflection, forming a uniform natural matt finish without gloss.
• Anti-Oxidation & Stabilizing Agents Prevent stannous ion oxidation to stannic tin, reduce sludge generation, extend bath life and maintain consistent matt texture during long-term mass production.
• Low-Tension Wetting Agents Improve surface wettability, eliminate pinholes, pitting and gas trapping, ensuring full coverage on complex electronic parts and fine-pitch terminals.
Standard Operating Parameters
Temperature: 20–30°C | Current Density: 0.5–2.0 A/dm² | pH: <1.0 | Continuous air agitation & filtration
Unique Technical Characteristics
Stress-Free Low-Stress Deposition Matt tin formula excludes high-stress brightener compounds. The deposited layer features extremely low internal stress, preventing coating warping, cracking and delamination on thin precision parts.
Fine & Dense Grain Structure Controlled crystal growth generates ultra-fine, compact tin grains. This micro structure improves surface density, hardness and overall coating integrity.
High Purity & No Contamination Residue No glossy brightener residues remain on the surface. Pure tin interface ensures clean soldering, no solder voids and stable welding strength.
Excellent Throwing & Coverage Power Acidic tin system delivers uniform thickness distribution on flat surfaces, edges and tiny gaps, avoiding over-plating on edges and thin plating in recessed areas.
RoHS & Lead-Free Compliant Pure tin formulation is lead-free, cadmium-free and fully environmentally compliant, suitable for consumer electronics, automotive and industrial certified products.
Compatible with Post-Treatments Perfectly compatible with anti-tarnish passivation, organic sealing and anti-fingerprint treatments to further enhance oxidation resistance and shelf life.
