heating 5/16" shrouds

[Douglas]

Were you going to use a air blower heat gun, of a flame blow torch ?

Once I read that heating ss above 400 degrees F , could change some of it's resistance to corrosion properties.

What kind of corrosion are you talking about ? The white powder kind from the aluminum, or the rusting kind from the ss ?

I clean the rusting kind from my ss with a ss pickling paste, but was never sure just what to use on the aluminum white powder.

Would any rigger out there use a lye solution on the aluminum, to desolve the white powder kind of corrosion that aluminum gets ?

A Lye solution is used to dip aluminum into, before washing, then going to an anodizing tank .

Has anyone tried re-anodizing a spot area, or a deep scratch area ?

Some say that you can not re-anodize aluminum, but I am not sure that is true, if you can remove all the old anodizing, and get back to base metal.

I have often wondered what would happen if I used the ss pickling paste on aluminum,,,, that paste is a combo of Nitric, Hydroflouric, and Phosphoric acids in a thickened solution.

I have used the ss pickling paste on bronze, and that cleans it very well, but it works best on ss to remove rust, and surface contaminants that corrode ss which results in pitting.

Don't get ss pickling paste on your paint, as that will "half life" that paint,,,, and don't get it on yourself, as that will eat your skin away to the bone.

Winchinox is similar to ss pickling paste .

Use any acid with extreem caution, until you can reliably predict the reactions .

Douglas