Professional Zinc Alloy Surface Finishing Solutions

金电铸

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 (母模制造)

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 (导电化处理)

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

Before

After

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 (脱模)

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

Karat	Au Content	Alloy Metals	Color	Bath Type	Hardness (HV)
24K	99.9%	None	Bright yellow	Cyanide or sulfite	50–90
22K	91.7%	Cu, Ag	Deep yellow	Cyanide only	90–130
18K	75%	Cu, Ag, Zn	Warm gold	Cyanide only	130–180
14K	58.5%	Cu, Ag, Zn	Pale gold	Cyanide only	160–210

📌 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.

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Workshop Planning Data

Gold Electroforming — Data Zinc Alloy Finishing Managers Need

Gold plating (rack and selective) and gold electroforming produce premium jewelry-grade finishes on zinc alloy, brass and silver — with tight karat control and high-value output per square meter.

350 m²Workshop Area

14 peopleTeam Size

120 kWInstalled Power

100-300k pcs/dayDaily Output (10 h)

Quality Inspection & Control

Check item	Method	Acceptance standard
Gold thickness	X-ray fluorescence	0.05-5.0 μm per karat spec
Karat / purity	XRF analysis	24K ≥ 99.9%, 18K ≥ 75% Au
Color match	Colorimeter ΔE	ΔE ≤ 1.0 vs karat master
Adhesion	Bend + thermal shock	No flake at 150 °C × 30 min
Wear resistance	Taber / rub test	No wear-through at spec cycles
Contact resistance	Milliohm meter	≤ 10 mΩ for industrial contacts

Workshop Layout & Floor Area

Zone	Area
Clean-room plating line	110 m²
Electroforming shop	80 m²
Precious metal store (vault)	20 m²
QA lab + XRF	40 m²
Rinse / DI / recovery	50 m²
Waste & gold recovery	25 m²
Utility & lockers	25 m²
Total workshop	350 m²

Manpower & Shift Plan

Role	Headcount
Platers / operators	7
Gold solution technicians	2
QC inspectors (XRF)	2
Precious metal control	1
Supervisor	1
Maintenance	1
Total (2 shifts × 10 h)	14

Power & Utility Demand

Equipment	Demand
Rectifiers (precious metal)	35 kW
Heaters / chillers	30 kW
Pumps / filters	15 kW
Clean-room HVAC	18 kW
Electroforming power	10 kW
Lighting & auxiliary	12 kW
Installed total	120 kW
Typical running load	≈ 95 kW

Production Flow Chart

PretreatmentPolish, clean, activate

Strike LayerNickel or silver strike

Gold PlateRack / barrel / selective gold

Rinse & RecoveryDI rinse + gold drag-out recovery

Dry & QCXRF thickness + color check

Protect & PackSeal, wrap, pack

Daily Capacity — 10-Hour Operating Day

Parameter	Value
Cycle time	30-60 min
Load per batch	30-80 kg
Batches per 10 h day	10-16
Daily output	100,000-300,000 pcs
Monthly output (26 days)	2.6-7.8 million pcs

Output Value Estimate

Parameter	Value
Plating fee per piece	USD 0.02-0.12
Daily output value (10 h)	USD 8,000-25,000
Monthly output value	USD 210,000-650,000
Annual output value	USD 2,500,000-7,800,000

金电铸

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