Professional Zinc Alloy Surface Finishing Solutions

Other Polishing

Vibration, Centrifugal, Magnetic & Electrolytic Polishing — A Complete Comparison

Four mechanical finishing methods compared head-to-head: process parameters, surface results, cost, and which parts each method suits best.

多种抛光设备全景振动/离心/磁力/电解抛光四种设备同框对比，车间实景，21:9横幅

Four Polishing Methods at a Glance

Each method has a sweet spot — the right choice depends on part geometry, target roughness and volume

Vibration Polishing

35–45 Hz, Ra ≤ 0.4 μm

Centrifugal Polishing

High speed, small parts

Magnetic Polishing

Complex internal cavities

Electropolishing

Brightness + passivation

▼

How Each Method Works

Four technologies, each with its own process window

1Vibration Polishing

Workpieces + ceramic/polyethylene media + compound in an oscillating bowl at 35–45 Hz. Ideal for deburring precision machined parts (Ra ≤ 0.4 μm). Batch process, gentle on edges.

Key Parameters

Frequency: 35–45 Hz

Media: Ceramic / PE cones

Target Ra: ≤ 0.4 μm

Cycle: 30–90 min

2Centrifugal Polishing

High-speed rotating barrel — parts + media pressed against the wall by centrifugal force. Fastest method for small sturdy parts (zipper pulls, small buckles, buttons). 5–15 min cycles.

Key Parameters

Speed: 100–300 RPM

Media: Steel balls / ceramic

Cycle: 5–15 min

Best for: Small parts under 20 g

3Magnetic Polishing

Stainless steel needles (0.5–2.0 mm diameter) suspended in a rotating magnetic field. The needles penetrate slots, threaded holes and internal cavities that other methods can't reach.

Key Parameters

Needle size: 0.5–2.0 mm

Magnetic field: Rotating AC

Best for: Complex internal cavities

Cycle: 15–60 min

Before

After

4Electropolishing (Electrolytic)

Anodic dissolution in a phosphoric-sulfuric acid bath. Removes 0.01–0.05 mm of surface metal, micro-smoothing to Ra ≤ 0.2 μm. Also passivates stainless steel — best for food/medical grade parts.

Key Parameters

Target Ra: ≤ 0.2 μm

Current density: 5–15 A/dm²

Temp: 55–75 °C

Time: 3–10 min

▼

Comparison Table — Pick the Right Method

For every part geometry we recommend the best fit — and we can combine methods

Method	Best For	Roughness	Cycle Time	Cost	Edge Damage Risk
Vibration	Precision parts, deburring	Ra ≤ 0.4 μm	30–90 min	Low	Low
Centrifugal	Small, sturdy parts	Ra ≤ 0.3 μm	5–15 min	Very low	Medium
Magnetic	Complex cavities, threads	Ra ≤ 0.3 μm	15–60 min	Medium	Very low
Electropolish	Stainless steel finish	Ra ≤ 0.2 μm	3–10 min	High	None

📌 Polishing Method Quick Reference

Vibration frequency35–45 Hz

Centrifugal speed100–300 RPM

Magnetic needle0.5–2.0 mm

Electropolish current5–15 A/dm²

Best roughness rangeRa 0.2–0.4 μm

Combined methods possibleYes — 2-stage

💡 Multi-stage polishing is commonMany parts go through 2 methods: vibration (bulk deburr) then electropolish (final finish). We call this hybrid polishing and recommend it for stainless steel hardware where both cost and quality matter.

FAQ

Which method is best for deburring zinc alloy zipper sliders?

Vibration polishing with fine ceramic media. It removes parting line burrs without damaging the thin walls. Centrifugal is too aggressive for thin-walled zinc alloy.

Can magnetic polishing clean internal threads?

Yes — magnetic needles penetrate M2 threads and even cross-drilled holes. This is the only mechanical method that reaches internal cavities without disassembly.

Does electropolishing change part dimensions?

Yes — material removal is 0.01–0.05 mm per surface. For tight-tolerance parts, we do a trial first and adjust the machining allowance accordingly.

Which method gives the best Ra value?

Electropolishing delivers Ra ≤ 0.2 μm — a true micro-smooth surface. But it only works on conductive metals, primarily stainless steel.

Can you combine methods on one part?

Frequently. e.g. vibration deburr → electropolish finish for stainless steel hardware. Or magnetic polish internal threads → vibration polish external surface. The combined per-part cost is still lower than hand polishing.

Get a Free Quote Today

Send us your samples or drawings — our engineers reply within 24 hours with pricing and technical advice.

Workshop Planning Data

Other Polishing — Data Zinc Alloy Finishing Managers Need

Mass finishing (vibratory, whirlpool, centrifugal and magnetic) deburrs and pre-polishes high volumes of zinc alloy parts automatically, with narrow cycle time and consistent quality for plating or painting.

280 m²Workshop Area

10 peopleTeam Size

88 kWInstalled Power

600k-1.2M pcs/dayDaily Output (10 h)

Quality Inspection & Control

Check item	Method	Acceptance standard
Deburring completeness	10× magnifier / edge test	All burrs removed; radius 0.05-0.15 mm
Surface roughness	Ra tester	Ra ≤ 0.6 μm for plating; ≤ 0.3 μm for bright finishes
Media separation	Air blow + visual	No media in holes; separation efficiency ≥ 99.9%
Chemical balance	pH / concentration test	Compound dosed per recipe; pH 7.0-9.5
Batch consistency	5 pcs / hour sampled	Gloss ΔE < 1.5 between consecutive batches
Dimensional control	Caliper 0.01 mm	Max material removal 0.02-0.05 mm per cycle

Workshop Layout & Floor Area

Zone	Area
Vibratory / whirlpool line	110 m²
Centrifugal & magnetic units	70 m²
Media washing / storage	40 m²
QA & control room	25 m²
Utility & locker	35 m²
Total workshop	280 m²

Manpower & Shift Plan

Role	Headcount
Line operators	6
QC inspectors	2
Supervisor	1
Maintenance technician	1
Total (2 shifts × 10 h)	10

Power & Utility Demand

Equipment	Demand
4 × vibratory bowls (7.5 kW each)	30 kW
Whirlpool / centrifugal units	22 kW
Magnetic polisher	12 kW
Media separator + dryer	8 kW
Air compressor	11 kW
Lighting & auxiliary	5 kW
Installed total	88 kW
Typical running load	≈ 70 kW

Production Flow Chart

Load Media + PartsRecipe-based media and compound charge

Mass FinishVibrate / whirlpool / centrifuge per cycle

SeparateMagnetic or screen separation of media

WashClean parts, recover compound

DryHot-air centrifuge drying

QC & TransferSample check, move to plating / paint

Daily Capacity — 10-Hour Operating Day

Parameter	Value
Cycle time	20-50 min
Load per machine	60-150 kg
Batches per 10 h day	12-18
Daily output	600,000-1,200,000 pcs
Monthly output (26 days)	15-31 million pcs

Output Value Estimate

Parameter	Value
Processing fee per piece	USD 0.0015-0.004
Daily output value (10 h)	USD 1,300-2,800
Monthly output value	USD 34,000-72,000
Annual output value	USD 410,000-870,000