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Professional Zinc Alloy Surface Finishing Solutions

Gold Electroforming

Gold Electroforming — Deposit-Forming of Hollow Jewelry, Badges & Precision Replicas

Electroforming builds 3D gold objects directly in the bath — no stamping, no casting. 100+ μm thickness, perfect texture reproduction, and weight-efficient hollow structures.

Electroforming vs. Electroplating

Plating coats a surface — electroforming builds the object itself

Hollow Gold

Wall thickness > 100 μm

Badges & Emblems

Crisp texture replication

Master to Part

Master mold + electroformed copy

Texture Reproduction

Micro-detail faithful copy

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The 4-Step Electroforming Process

Master → Conductive → Deposit → Demold — each step determines the final quality

1Master Pattern Making

Master can be wax (lost-wax electroforming), 3D-printed resin, silicone, or metal. Surface must be smooth and detailed — every scratch on the master appears on the electroformed part. For jewelry, UV-cured resin masters give the best detail.

Key Parameters
Master materials: Wax, resin, silicone, metal
Surface finish: Must be flawless
Detail replication: Down to 10 μm features

2Conductive Coating

Non-conductive masters (wax, resin) must be made conductive. Three methods: (a) silver spray (most common), (b) electroless nickel (for high-temp baths), (c) graphite powder (environmental). Resistivity must be < 1 Ω/cm².

Key Parameters
Silver spray: Standard, < 1 Ω/cm²
Electroless Ni: For hot baths > 50 °C
Graphite: Eco option, lower conductivity

3Gold Electroforming

Cyanide or sulfite gold bath with low current density (0.1–0.5 A/dm²). Deposition rate: 5–10 μm/hour. Builds up to 100–500 μm total thickness. Slow deposition = dense, stress-free gold. Bath temperature 50–65 °C.

Key Parameters
Current density: 0.1–0.5 A/dm²
Deposition rate: 5–10 μm/hour
Final thickness: 100–500+ μm
Bath temp: 50–65 °C

4Demolding

Separate the electroformed gold shell from the master. For wax masters: melt out in hot water (reusable if wax). For resin: dissolve in solvent or mechanically peel. Silicone masters peel off cleanly and can be reused 50–100 times.

Key Parameters
Wax master: Melt out (60–80 °C)
Resin master: Solvent dissolve
Silicone master: Peel off, 50+ reuses
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Karat Gold Electroforming Systems

Electroforming baths can be formulated for different gold purities

KaratAu ContentAlloy MetalsColorBath TypeHardness (HV)
24K99.9%NoneBright yellowCyanide or sulfite50–90
22K91.7%Cu, AgDeep yellowCyanide only90–130
18K75%Cu, Ag, ZnWarm goldCyanide only130–180
14K58.5%Cu, Ag, ZnPale goldCyanide only160–210

📌 Gold Electroforming Quick Reference

Deposit thickness100–500+ μm
Current density0.1–0.5 A/dm²
Deposition rate5–10 μm/hour
Master reuse50–100× (silicone)
Typical purity14K–24K
Detail replication10 μm features
⚠ Electroforming is slow — plan your production accordinglyA 200 μm wall thickness takes 20–40 hours of deposition time. Rushing with higher current density creates rough, stressed gold that cracks. We run overnight shifts on a rectifier timer. For urgent jobs, we stock pre-deposited semi-finished shells.

FAQ

What is the wall thickness for hollow gold electroformed jewelry?
Standard: 100–250 μm for earrings and pendants (light enough to wear comfortably). Larger pieces (bracelets, bangles): 200–500 μm for rigidity. Any wall thickness down to 50 μm is possible for ultra-lightweight designs.
How many reuses can a silicone master give?
High-quality silicone masters last 50–100 cycles before degrading. Wax masters are single-use (melted out). 3D-printed resin masters can be reused 5–15 times depending on the dissolution method.
Can electroforming reproduce fine texture like leather grain or fabric weave?
Absolutely — this is the biggest advantage of electroforming over casting. A leather-textured wax master reproduces every grain line and fiber impression in the gold down to 10 μm resolution. The result is visually indistinguishable from the original.
Is gold electroforming more expensive than casting?
Per gram: electroforming is similar to casting. Per piece: electroforming wins because you only deposit gold where needed. A hollow 5 g electroformed pendant looks like a 15 g cast piece. Gold cost saving is 60–70%.
What is the difference between K gold electroforming solution and pure gold?
K gold electroforming baths contain alloying metals (Cu, Ag, Zn, Ni) that co-deposit with gold to produce 18K or 14K color and hardness. Pure gold (24K) baths contain only gold salts. K gold formulations are more complex to control because the alloy ratio changes with current density.

One-Stop Line Supply — Common Buyer Questions

Besides electroforming equipment, do you supply the full chemical and material package?

Yes. QLQ supplies conductive coatings, electroforming solutions and all consumables as one package — equipment, chemistry and support from one supplier. Details on the turnkey solutions page.

Can you build a complete gold electroforming line for a new factory?

Yes. Turnkey delivery covers line design, equipment, chemicals, installation, commissioning and operator training — 25 years of line-building experience, 60+ countries.

Do you provide process recipes and technical support after delivery?

Yes. Every line ships with process parameter sets, QC SOPs and lifetime technical support including upgrades.

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