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Thread: what is this coated with?
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3rd Feb 2021, 10:59 AM #1New Member
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what is this coated with?
hi all. im new here, and new to mig welding. many years with a stick but wanna learn mig. something im trying to work out is what this is coated with. i have this piec of old try i want to practice with, but it has some kind of coating on it that i cant see.
ive tried hydrochloride acid, sulphuric acid, acetone, thinners, petrol, blowtorch. nothing removes it.
ive noticed that a few other pieces of scrap seem the same somehow. quite simply, i cant trike an arc on them.
what is this coating and how do i remove it?
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3rd Feb 2021, 11:23 AM #2Intermediate Member
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3rd Feb 2021, 01:02 PM #3Most Valued Member
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Itll be anodised. Id just buy some sheet or bar of a known grade.
Sent from my SM-G973F using Tapatalk
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3rd Feb 2021, 01:57 PM #4Member: Blue and white apron brigade
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Quite few things will remove anodising but unfortunately may also attack the Al underneath - caustic soda base drain cleaner for instance will do that.
There is a product called "Greased Lightning" which is commonly used to strip anodising off small parts but its MSDS says itsa 10% solution of caustic soda plus glycol ether and a surfactant. It claims not to affect the Al but it does say not to leave parts in for too long.
Anodizing can be dissolved without affecting the underlaying Al using a dilute solution of phosphoric and chromic acid. The latter is nasty stuff - best kept away from.
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3rd Feb 2021, 02:50 PM #5Most Valued Member
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Is there a reason you can't remove it mechanically?
Steve
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3rd Feb 2021, 04:19 PM #6New Member
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thanks for your replies guys.
to answer questions 1 by 1.
theres no reason i cant remove it mechanically, just time and work thats all.but for the sake of learning id also like to learn what it is, how do i tell, and other possible ways to remove it.
i will check out the phosphoric and chromic acid.
after playing around with it, i realized if i grind 1 piece, i can run from that as long as i dont try to flow too fast. i cant start an arc on a fresh clean piece,but as long as i weld from a previous weld im right. the way that it pools is slightly different, so a matter of playing with the settings.
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3rd Feb 2021, 05:32 PM #7
Hi jfoldbar,
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Grahame
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3rd Feb 2021, 06:45 PM #8Senior Member
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Welcome to the forum.
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