Parts list d14

[saintpoida]

what is passivation?

[keithturtle]

Boiled in acid.   The process uses acid to remove any traces of Fe in the surface of yer pipes / plates.  Then when ye run 'em they don't turn brown.

Big in the food industry so SS doesn't contaminate food with traces of rust.

Iron cain'toxidise if it ain't there.
I use a one-step process and a chemical called citrisurf.

http://www.stellarsolutions.net/2050data.htm

SOak 11 min at 80-'C then rinse with distilled water.  Handle plates with gloved hands forever thereafter [no skin oils]

Turtle

[saintpoida]

oh ok so thats similar to the idea of annealing?

Pete

[keithturtle]

not really.  Annealing is a heat process, where passivationg uses chemical action to git rid of free Fe.  The heat jes accellerates it.  It would work cold, jes slower.

Annealing helps when, after "working" a piece, residual magnetic fields are eliminated.

Fe (free iron) is what turns the water brown and precipitates to the bottom.

Keith