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Zinc-Aluminum Alloy Specimen Preparation
(Class 1 Procedures)

Metallographic Class 1 sample preparation


Zinc-aluminum alloys are difficult to prepare because they are soft and contain oxide particles which can become dislodged and scratch the surface. The key to polishing zinc-aluminum alloys is to use alumina polishing abrasives to reduce fractured abrasive particle embedding and to final polish with polycrystalline abrasives (fine aggregates).

SECTIONING

MAXCUT Abrasive blade (Cat. No. MAX-C or MAX-I series)

MOUNTING

Compression Mounting with Phenolic, Epoxy or Diallyl Phthalate compression mounting resins

POLISHING

Abrasive/surface

Lubricant

Force/ sample

Speed
(Head/base)

Time

P220 grit ALO paper
P500 grit ALO paper
P1200 grit ALO paper

Water

5-10 lbs

100/100 rpm

Until plane
1 minute
1 minute

1 um DIAMAT diamond on ATLANTIS polishing pad

DIALUBE Purple Extender

5-10 lbs

100/100 rpm

2 minutes

0.05 um Nanometer alumina on NAPPAD polishing pad

 

5-10 lbs

100/100 rpm

1 minute


Metallographic microstructure for zinc aluminum alloy

Zinc-Aluminum Alloy, 200X B.F. (etchant CrO3, Na2SO4)

Zinc aluminum metallographic microstructure

Zinc-Aluminum Alloy, 1000X DIC (etchant CrO3, Na2SO4)

Polarized light metallograhic microstructure of zinc aluminum

Zinc-Aluminum Alloy, 100X Polarized (etchant CrO3, Na2SO4)

ETCHING

Common Etchants
PACE Technologies Recommended Etchants

PACE Technologies Etchant Database

CAUTION:Safety is very important when etching. Be sure to wear the appropriate protective clothing and observe all WARNINGS on chemical manufacuters SDS (Safety Data Sheets). Also review the COMMENTS and CONDITIONS Section for each etchant.


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email: pace@metallographic.com
www.metallographic.com


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