If you have samples of known materials, and one of those spring-loaded centerpunches, you can compare the sizes of the craters with a micrometer. The back side has to be rigidly supported in all cases.
Stainless steel is sometimes "passivated" (controlled oxidation) for better corrosion resistance, which leaves a satin finish that could be mistaken for Aluminum. - GT > -----Original Message----- > From: Rich Rudman [mailto:[EMAIL PROTECTED]] > Sent: Saturday, September 28, 2002 1:17 PM > To: [EMAIL PROTECTED] > Subject: Re: NiCd boxes. > > > [EMAIL PROTECTED] wrote: > > > Well time to eat Crow. > > While on the phone to Dennis. This is a 8 hour a week habit > right now... > > I had him do a NiCd electrolyte splash test. He dumped some > Koh onto a slab of Aluminum. First Nothing, then about 30 > seconds later, small bubbles. Definatley liberating Hydrogen. > That means that the cases I have are NOT Aluminum. What > they are is still a mystery. Most likely Stainless. NON > magnetic, non Rusting, funny Alum color but heavier. NOT grey > like Titanium. > I would now test the Steel to see what it does, and > also Stainless to see the effect. > > The Alum and KOH is the Draino test. It better fizz. > > -- > Rich Rudman > Manzanita Micro > www.manzanitamicro.com > 1-360-297-7383,Cell 1-360-620-6266 >
