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PostPosted: July 20, 2012, 11:35 pm 
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Joined: September 30, 2005, 1:28 am
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Location: Sunny-Okanagan, Canada, eh?!
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Top two - chromed. Bottom four - not chromed.

I needed some flat steel to transition from the 1" wheel archs on Chassis #2 to the 3/4" tubes behind the seat back bulkhead. I thought "washers would work great" only, you really shouldn't weld chrome.

An hour immersed in Muriatic Acid, and now they are de-chromed.

You'll want to be up-wind of this stuff. And wear rubber gloves and "real" goggles.

I wonder if the acid might be a bad thing when welding....

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PostPosted: July 21, 2012, 2:29 am 
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I wonder the same things. I have done this with galvanized steel. Then I give it a dip in baking soda and water. The metal comes out very nice, a matte grey and seems to weld well. I use this on scrap that I practice welding on. Just wonder wether it would work on galvanized square tube without hurting the metal.

I've seen washers welded to tube where bolts pass thru it, like ears for suspension mountings and other places.

I think it's reasonable for doubling up for bolt holes etc.

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PostPosted: July 21, 2012, 10:58 pm 
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I've been using phosphoric acid to strip mill scale and rust from hot rolled steel before painting. I buy one gallon jugs of 'klean strip' at home depot in the paint section. Just mix it 4 parts water to 1 part acid and let small parts soak in it for at least thirty minutes, agitating the bucket from time to time. This is the same acid in coke and other soft drinks. It works well for curing hams, cleaning change, etc. I've read on the net that muriatic will do the same as phosphoric, but it's typically stronger andmeantfor brick cleaning and other fun stuff.


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PostPosted: July 22, 2012, 2:52 am 
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Joined: January 16, 2012, 4:16 pm
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Location: near Edmonton
I use vinegar to remove mill scale instead of muriatic acid. It takes longer but doesn't really need to be nuetralized afterwards. When basically used up I then spray it on weeds. Will have to try it on plated washers


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PostPosted: July 22, 2012, 8:21 am 
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If using muriatic, it also should be cut with water. Use a new, 5 gallon paint bucket with lid for the mix for one gallon muriatic. Trade cleaning time for toxic fumes.

If I didn't already have muriatic dip, I'd use the clean strip from now on.

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PostPosted: July 22, 2012, 12:31 pm 
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So no more worries about working with galvanized tubing. I wonder exactly how totally crappy that Home Depot 1 3/8" tubing for fences really is? I've seen it listed as 15 gauge...

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