EDM Service
AZ91 Magnesium Alloy Micro EDM Surface Integrity Review for Microfluidics & Lab Devices
For Microfluidics & Lab Devices, Micro EDM can produce the required conductive features in AZ91 Magnesium Alloy, but a low Ra value does not approve the surface by itself. Recast, micro-cracks, edge damage, corrosion or fatigue risk, and post-processing must be released as separate requirements.
Quick Answer
For Micro EDM on AZ91 Magnesium Alloy in Microfluidics & Lab Devices, approve the functional surface in separate steps. First verify geometry and roughness. Then verify recast or crack acceptance, edge condition, and any corrosion, fatigue, or post-process requirement that the application actually needs.
Key Surface Decisions
Why Surface Integrity Matters Here
The highest application risk is blocked flow paths, edge damage or inspection methods that cannot resolve the feature. A defect on that functional face can shorten service life, compromise the application requirement, or force rejection even when the overall dimensions are correct.
How to Specify Surface Requirements
Define surface acceptance for Microfluidics & Lab Devices by separating roughness, recast, cracks, edge condition, and post-processing. For the Micro EDM feature in AZ91 Magnesium Alloy, identify feature size, aspect ratio, burr/recast, inspection method, state the exact material condition, and assign an inspection method to each accepted item.
What Gets Missed
The most common acceptance error is releasing the Microfluidics & Lab Devices part from roughness or size alone while recast, edge damage, or sub-surface cracking remains on the named functional face. For AZ91 Magnesium Alloy, the final feature may pass size inspection while failing its surface, edge, corrosion, or stability requirement. In Micro EDM, the feature can round, drift, or become impossible to verify when electrode wear and measurement resolution consume the tolerance.
Why the Process Affects the Surface
A fine electrode and low-energy pulses remove very small volumes without cutting force. At this scale, electrode wear, gap stability, dielectric access, thermal drift, and optical measurement resolution can be as important as the programmed tool path. For Micro EDM on AZ91 Magnesium Alloy in Microfluidics & Lab Devices, the release plan must connect the named functional face to feature size, aspect ratio, burr/recast, inspection method.
Micro EDM Capability Reference
| What you're asking | What you can expect |
|---|---|
| Feature types | micro holes, micro slots, miniature cavities, fine pins, and sub-millimeter precision details |
| Tolerance | ±0.002–0.010 mm |
| Surface finish | Ra 0.1–1.6 μm |
| Feature scale | Sub-millimeter holes, slots, and cavities |
| Primary micro limit | Electrode wear and measurement resolution |
| Main limitation | Loose-tolerance or easily accessible features are rarely economical with Micro EDM. |
Microfluidics & Lab Devices Surface Planning
| What matters | What to expect |
|---|---|
| Typical parts | micro-slot plates, small-hole components, laboratory fixtures, and test coupons |
| Functional requirement | micro slots, small holes, controlled channel edges and inspection matched to feature size |
| Main failure risk | blocked flow paths, edge damage or inspection methods that cannot resolve the feature |
| Inspection focus | feature size, aspect ratio, burr/recast, inspection method |
Material Condition Reference
| Condition | What to expect | Watch out for | Surface notes |
|---|---|---|---|
| as-cast | Use stable support and economical roughing. | Clamping and material condition can move delicate features. | Apply fine finishing only to functional faces. |
| solution-treated | Balance dimensional stability with feature-specific finishing. | Residual stress can shift thin sections or small details. | Identify wear, seal, fatigue, or contact surfaces. |
| aged condition | Use conservative energy and selective inspection. | Finished or hardened surfaces can be sensitive to edge damage and recast. | Use lower-energy finishing or post-processing where function requires it. |
Application and Material Context
AZ91 Magnesium Alloy is a cast magnesium-aluminum-zinc alloy whose porosity and casting condition can vary locally. In Micro EDM for Microfluidics & Lab Devices, state the supplied condition, support the functional features, and define surface and inspection requirements separately. The material condition affects the acceptance route, but it is not itself a substitute for application-specific surface criteria.
Functional Surface-Integrity Requirements
For Micro EDM on AZ91 Magnesium Alloy in Microfluidics & Lab Devices, use separate acceptance statements: roughness for texture, recast for the resolidified layer, crack inspection where fatigue or brittleness matters, edge inspection for rollover or chipping, and corrosion or post-process verification where service requires it. Evaluate feature size, aspect ratio, burr/recast, inspection method from the correct datum.
Microfluidics & Lab Devices Surface Checkpoints
- State the exact AZ91 Magnesium Alloy condition and identify the Micro EDM features.
- Mark the functional faces and specify roughness, recast, edge, corrosion, fatigue, passivation, or post-process limits separately.
- Define how feature size, aspect ratio, burr/recast, and inspection method will be inspected before batch release.
Limits and Better Alternatives
Main Limit
A low Ra value cannot by itself approve the AZ91 Magnesium Alloy Micro EDM surface for Microfluidics & Lab Devices.
Consider Another Route When
Use conventional EDM for larger features, precision laser processing for suitable thin geometry, or mechanical micro-drilling where a tool can reach.
Practical Next Step
Send the Microfluidics & Lab Devices drawing with the AZ91 Magnesium Alloy condition, Micro EDM features, functional faces, roughness target, recast or edge limits, quantity, and the method used to inspect feature size, aspect ratio, burr/recast, inspection method.
Practical Takeaway
For Microfluidics & Lab Devices in AZ91 Magnesium Alloy, Ra is only one part of Micro EDM surface approval. Release the affected layer, material risk, post-process, and functional inspection separately.
Additional Project Information
Include application, destination and end-use notes together with the material, quantity and drawing requirements.
Project Details for Technical Review
Include application and end-use notes when they affect material, inspection, documentation, or export review.
- Process: Micro EDM
- Material: AZ91 Magnesium Alloy
- Application: Microfluidics & Lab Devices
- Drawing or part sketch
- Material grade
- Thickness / part size
- Quantity
- Tolerance and critical dimensions
- Surface finish or inspection requirement
STEP/STP, DXF, DWG, PDF, IGS/IGES or ZIP.
Confidential drawing review. NDA support available on request.