Cold Bluing Does Not Stop Rust

hey there welcome back to the channel today we're going to talk about bolts specifically the coating on bolts and how it prevents rust taking apart a true Spirit these are the spring bolts that came off you can see they've got this yellow chromate underneath this is zinc so that's supposed to help prevent them from rusting you can see the ends of them and the nuts well they still got pretty Rusty admittedly these may be as old as 40 years or so but I still am not a big fan I'm going back in with grade 8 bolts obviously bigger than this but this is a good surrogate the problem with grade eights is they almost always come in this same yellow chromate I'm not a big fan of this color though I will say I do like this better than Rusty Brown so we're going to see if we can do something about this and coat them maybe prevent some Rust since I'm going to be doing these I figured I'd grab some just zinc coated grade twos and we'll do the same that we do to these as the grade two and I did buy just one black oxide grade eight so we'll see if it fares any different than these the plan is we'll just keep two as controls then we'll take these two strip them down to just bare steel and test those we'll strip the rest of these one pair of them we're going to put a cold blue on the next pair I'm going to try some of this chassis black that I used on the frame and then the last pair I've just got some of this hanging out on the Shelf it says it's rust stop so we'll give that a try we'll coat all of these let it the coating dry and then what we'll do is we'll put them all into a solution that is probably acidic with some salt in it things that are known to flash rust steel and we'll dip them in let them dry dip them in that kind of thing do that for I don't know a day a couple of days we'll see how it turns out we'll try to rust all of them and compare what the different finishes do to prevent that rust on each one let's get started first we're just going to set aside these three one of each type of coating we'll set them off to the side those will be the control not going to do anything with those the remainder of them we're going to strip ing the coating off them is fairly easy foreign we're going to use some areatic acid this is also known as hydrochloric acid it is also extremely not friendly to flesh and Skin So glove up I'm sure I could dilute this with some water but I'm just going to go straight in bear in mind this is going to give off fumes so do this in a well ventilated area foreign they've only been in there oh I don't know maybe four minutes maybe not even that long you can see there already black they're pretty well stripped I see them still bubbling a little bit so we'll give them a good stir here I believe these ones that are a little bit blacker were probably the ones that had the yellow chromate on them so you can see it's still got something on it for safety just in case I have a problem I've got a bucket of water here and dissolved in that I've got some baking soda the hope is I don't need it but when they're done cooking I'll take them out of there and drop them in here to neutralize all that acid then I'll rinse the bolts off take the remainder of this slurry and put it into that bucket as well to neutralize that before disposing of it you don't want to just dump this down the drain or anything like that it's not good for plumbing either all right it's been about 15 minutes we'll take them out and rinse them off so the ones that were just zinc coated you can tell they're grade two they're pretty clean already the ones that had the yellow chromate or the kind of this black color but that wipes off pretty easily so I'm going to get them all cleaned up before we coat them all right they're all clean while I was cleaning them I had second thoughts I'm actually going to do two of them with the cold blue and leave one with just the bluing and the other one I'm going to wipe down with oil which is what they recommend with this so we'll test it unoiled versus oiled cold blue then we'll do chassis black and then one with no coating at all I do have one other grade 8 bolt here that I played around with just for clearing off the coating maybe we'll put that uh that rust stop on this just for fun okay I'm going to coat four of these with this Perma bloop this is a brand you know Birchwood Casey you can get this from other brands basically if it's a light blue liquid clear liquid it's the same stuff as this my understanding is you're never supposed to double dip with this stuff so using a different end of the Q-tip every time then after you coat it supposed to rinse it off with water and then wipe it dry I am going to do a second coat on all of these but I'll go through and do the first coat on the other three so here's after one coat you can see it's fairly dark and hit it with a second just to give it that uh a little bit better penetration or coating anyway next up we'll do a couple of them in chassis black I'm going to let these two chassis blocks dry for a bit then I'll go back and do a second coat it's been 24 hours so I'm going to wipe down these two and these two you can see it's kind of got this brownish color to it not sure what that's about but these are the blue ones then I'm going to oil one of each okay we've got them all prepped all coated let's make the solution that will Rust them and start dipping them all right they've all dried and I've just wired them together so these are the originals these are the two that are script uh these are the ones that are blueed with no oil glued with oil chassis black and then these are those two extra ones one's got a oxide coating and the other one has that just you know rust block let's move them in here and we'll just get them covered in vinegar we'll let them sit for a while then take them out and go back and forth to try to make it a little more corrosive I'm going to add some of this which is you can see down here calcium chloride and sodium chloride blend they've been sitting there about 10 minutes I'm going to pull them out let them air dry and then put them back in and back into the vinegar the last time didn't seem to do much so I'm going to leave them in here for a long period of time hour or two maybe even just overnight at any rate we'll let them sit here for quite a while we'll come back take them out dry them again it's been roughly 48 hours since I started this they've been in and out of the vinegar solution when I wasn't in the vinegar I actually had them suspended so they were just above the surface that way any Vapors coming off of it they'd be in kind of a harsh condition even when they were in the uh just open air let's take a look at what we've got here are the original coated you see this uh the gold nitrate off of these that's pretty much gone and in fact the zinc on this one it's definitely discolored I don't know if it's missing but I think it probably is it probably ate through that zinc or at least some of it looks like maybe a little bit of rust starting there hard to say but that's the factory Bolt here's completely uncoated you can see they they definitely started to corrode here some rust on there was big flakes that actually came off in the in the liquid there so those are definitely Rusty but that's expected there's zero coating on those these are the cold blue without oil lots of scaly rust going on there cold blue with oil really looks no different to me also very Rusty and scaly the coated ones these are painted let's get some of that off of there can't really tell but it looks like looks like there's a little bit of rust maybe maybe not maybe it was just rust from one of the things next to it they look like they're in really good shape not surprising I mean you put a a thick coating on something then here's those two spares this is with that stop rest enamel and that definitely did what it said it was supposed to do it definitely didn't rust so this is a really good coating but you know it's about the same as doing the chassis black so something that actually coats it does well this one's a little bit of a surprise this is that uh you know Factory nitride it came black like this and look at how rusted up it is so it looks like that black coating you know even from the factory is not a very good rust protector what's the conclusion I'd say that if you've got bolts that are going to be in a harsh environment such as the underside of a chassis of a vehicle they need to be coated I like the idea of black and I had hoped that something like that would you know have prevented rust but it's uh it's gone crusty real quick so really what you have to do you're going to have to coat it with something like this chassis paint so that tells me that I'm just going to use brand new grade 8 bolts to put these Springs on and then the nuts and the heads after it gets assembled are going to get coated that's all there is to it thanks for watching

Channel: Yoshimoshi

Views: 3,891

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Id: n1rTUlApzuk

Length: 13min 22sec (802 seconds)

Published: Wed Dec 14 2022