MichaelP
Titanium
- Joined
- Dec 7, 2008
- Location
- IL/WI border
One of my .752"-.832" gage pin sets has some rust with minor pitting at one end of the pins. This set is not used for anything super precise, and the opposite 2/3 of the body end is in a perfect shape.
I tried using phosphoric acid for the affected end, but it makes the surface dull grey. First of all, I wonder why. I know that Evaporust or phosphoric acid solutions remove oxides. But what's on the surface of a regular gage pin to become dull? Isn't it just a ground steel?
Any other methods you'd prefer, or you just wouldn't worry about dull appearance? I assume that using phosphoric acid is less detrimental to the pins (vs. use of any abrasives, even the mildest ones like white scotch Brite, buffing, etc.)
P.S. Yes, I certainly understand that rusted gage pins are thrown away and replaced. But this particular set is sufficient for my modest homeshop tasks.
I tried using phosphoric acid for the affected end, but it makes the surface dull grey. First of all, I wonder why. I know that Evaporust or phosphoric acid solutions remove oxides. But what's on the surface of a regular gage pin to become dull? Isn't it just a ground steel?
Any other methods you'd prefer, or you just wouldn't worry about dull appearance? I assume that using phosphoric acid is less detrimental to the pins (vs. use of any abrasives, even the mildest ones like white scotch Brite, buffing, etc.)
P.S. Yes, I certainly understand that rusted gage pins are thrown away and replaced. But this particular set is sufficient for my modest homeshop tasks.