What exactly were you trying to determine with your extremely un-scientific test? I don't generally, (or ever), drill liquids. The oxide coated bit will wear out just about as fast as an uncoated high speed steel bit, except in wood that has high acidity resins, like oak and some hickory. The carbide bit is a good all purpose bit for wood and most metal. Masonry bits have carbide tips also. The cobalt bit is for cast iron and hardened steel. The titanium coated bits are usually poor quality steel and break very easily.
Black oxide was a huge surprise. I love this channel! It's sort of a do it yourself / extreme reagents channel. I would recommend this channel to anyone who likes @ExplosionsAndFire, the Australian shed chemistry channel.
Black Iron, hematite, Fe3O4... Absurdly resistant to most chemicals...but hydrochloric acid + zinc chloride strips it right off. 'Tinners Fluid' is another name for the acid mixture...soldering flux!
What exactly were you trying to determine with your extremely un-scientific test? I don't generally, (or ever), drill liquids. The oxide coated bit will wear out just about as fast as an uncoated high speed steel bit, except in wood that has high acidity resins, like oak and some hickory. The carbide bit is a good all purpose bit for wood and most metal. Masonry bits have carbide tips also. The cobalt bit is for cast iron and hardened steel. The titanium coated bits are usually poor quality steel and break very easily.
Now i know what i need for drilling that hno3/hf container
Built to last
Much easier to pull electrons from gold oxide. Gold metallic bonds are much stronger so thermodynamicly less favourable to break
But then the opposite is said about metals that form passivation oxide layers like aluminium
Cobalt are for stainless steel and work fine. The rest dunno.
So what?
try in milk.
you could be surprised.
who is going to do this to a drill bit? lol
Asking the big questions
ME
Nobody has to now. Osmo did it so we don't have to!!!
Black oxide was a huge surprise. I love this channel! It's sort of a do it yourself / extreme reagents channel. I would recommend this channel to anyone who likes @ExplosionsAndFire, the Australian shed chemistry channel.
Black Iron, hematite, Fe3O4...
Absurdly resistant to most chemicals...but hydrochloric acid + zinc chloride strips it right off.
'Tinners Fluid' is another name for the acid mixture...soldering flux!