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2022-05-24T19:04:05Z

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[[Category: SOP]]

<big>Loss Prevention</big>
# Safety glasses should always be worn in the metallography labs
# Gloves should always be worn when working with chemicals
# Wear a respirator when working with powders

<big>Procedure</big>
# Place the sample face down on a cotton round in a beaker of ethanol and leave the beaker in the ultrasonic cleaner for five minutes, then dry with compressed air
# Secure 240 silicon carbide pad in the polisher and apply a load of 20 N to the sample, force adjustments are made by turning the wheel above the sample. The height of the bolt in the slot above the sample indicates the force applied (figure 1)
[[File:MgPolishingEtchingFigure1.jpg|thumb|Figure 1: Automatic Polisher]]
# Run polisher for 2 minutes with water constantly rinsing the pad, make sure the head is locked in place
# Remove sample and rinse with water, fold and throw away the polishing pad
# Repeat steps 2-4 with 320, 400, 600, and 800 polishing pads and 1 minute intervals
# Repeat step 1
# Polish the sample using a diamond pad with RedLube (Methanol Propylene Glycol) for 5 minutes, do not rinse the pad with water
# Repeat step 1
# Make a suspension of roughly ⅓ cup alumina powder in 20 fl oz water
# Polish the sample with a flocked pad for 5 minutes, keep the pad wet with the suspension. Do not add water except to rinse the basin
# Repeat step 1
# In the fume hood, use a cotton swab to apply a small amount of nital for several seconds
# Rinse the sample with water, then spray with ethanol and dry with a hair dryer

Mg Polishing & Etching - Revision history

Gcanzalo: Copied from old