On Friday 24 August 2012 03:59:31 Jan de Kruyf did opine: > > I have never seen such a material on this side of the pond, Jan. > > Where does one get it? > > DuPont makes it if I am not mistaken. It is used to make bearing bushes > for valves and the like. > The price is not quite up to Moglice standards. But $100 is also quickly > paid for that stuff. > > I forget what the etching liquid is, but it is quite aggressive and very > nasty (only for use in 3rd world :) > The supplier always makes me wait a few days "for the weather to get > right for etching". > Sounds like diluted, nearly killed with tacks, 50/50 mix of nitric and hydrochloric acids, CP, but the end product of that is rust and drifting clouds of unfriendly yellow smoke. I made some 'slow rust' gun bluing solution once back in about '62. Worked great but was 'interesting' to make. I blew the smoke from dropping small tacks and nails into it out thru a window screen with a box fan, which burned out shortly thereafter, along with a fan sized hole it ate in the window screen. :(
The spent solution was decanted into a clean, glass stoppered bottle, and applied to the cleaned and degreased gun metal, give it a coat, it turns bright red with a very fine rust, which you wire brush off, repeat 15-20 times and you are left with a very dark gray coat of iron nitride that is very hard and turns nearly black when oiled. Very durable finish except I found a turkey salad sandwich turns it back white instantly. > In any case I see you are of the generation of "the wooden ships and the > iron men" I had a wooden boat once. Someone had glassed the bottom so it was super slick. A 12' runabout style. Only about 1/8" of keel, it could with a Mercury KD10 on it, do about 35 mph in a straight line, but when up on plane that way it took the whole main bowl of Pactola Lake in the black hills to turn it around because it could slid sideways like a pumpkin seed. Scary. As for the iron man I'm amazed I haven't drowned because up to about 55 yo, I sank like I was iron. I didn't go into anything deeper than a bathtub without a life jacket. > I learned my trade on the iron ships, see. :) I spent a summer working in a foundry. It was NOT fun, and some of my back problems date to that. Cheers Jan, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! A friend is a present you give yourself. -- Robert Louis Stevenson ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
