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Blueing - rust and removal
Hey all.
I am a rust magnet.... my fingerprints rust onto metal in no time flat, I sweat a lot, I also live next to salt water.
I buy old tools and fix them up (to some degree of proficiency) and then use them. I have a 'collection' of old tools... they are all users and I do not have any precious 'mantlepiece' tools (actually, all my tools are mantlepiece items, 'cause they are old, have a fair amount of time invested into them, and work :2tsup: )
I am not meticulous enough to be chasing tools around with a waxed or oiled rag all the time. I am not a full time woodworker, so in the time I have to put to woodwork, I want to minimise the rust removal/prevention process as much as possible.
The other day, I pulled out a spokeshave that I hadn't used for a year or more, and even though the blade was sprayed in lanolin after use and then stored in a old timber cupboard... the back of the blade and edge is rusted.
I hate that. It means that I've pretty much got to go back to square1 and re-flatten/polish the back, re-do the edge.... blah blah blah. Rust sucks man.
IMO rust sucks.
I hate it.
But there is no magic bullet, IMO, rust happens and needs to be kept on top of.
But there are different ways to get rid of it and to keep on top of it.
Blueing tools is one way.
Here is my take on it.
Over the last year or so I've followed Bob Smalser's posts here on removing rust and then blueing tools. Blueing does not remove the need to oil tools, but it does provide added protection. Think 'belt and braces', or '...... and clingwrap'.
(a plastic bag, jokers!):D
Pic 1:
Demo - Rusted 1950's-ish saw, with @30% Phosphoric acid, @7% Sulfuric acid "Birchwood Casey Rust and Blue remover" dribbled onto it. MSDS here. I use this stuff as I can conveniently purchase it. Normally I would treat the whole surface equally, but for demo purposes, I've dribbled it willy-nilly.
Pic 2:
Sprayed off with water.
Pic 3:
80 grit paper applied to it, 20 strokes back and forward, then sprayed down with water.
Pic 4:
Last pic is a closer detail showing the difference between the 'dribbled area' and un-dribbled area' after 20 strokes of 80 grit sanding.
This attempts to show that the acid treated areas 'shed' rust faster and there is the beginning of rust conversion.
Phosphoric acid reacts with rust to form a black ferric phosphate, which can be removed, or left on the tool to provide further (moderate) rust protection. In other words, the black ferric phosphate leaves a 'skin' which is a lower end form of rust prevention.
I'll keep working on one side of this saw with both abrasive alone and then 'phosphoric acid and abrasive', and post the end result.
I intend to treat the other side with electrolysis, clean the surface with abrasive, and post those pics. I'll try to spout off a bit on the effect and process of electrolysis.
Then I intend to blue one side and show the result.
Lastly, I will oil both sides of the saw and subject it to some abuse to see how an 'oiled side' versus a 'blued and oiled' side holds up.
I know that detailed pics will be hard, trying to capture the 'grain effects' and also the detail of 'what happens to the original etching' will be a challenge.
Hope this is of benefit so someone.
Chime in with your opinions, facts, experiences, dissenting viewpoints, spelling correcctions, rabid obsessions and whatnot, please. All welcome, if you think that rust sucks.
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