ANTI-CORROSIVE PROCESS.

Manawatu Times, Volume II, Issue 68, 13 June 1877, Page 3

ANTI-CORROSIVE PROCESS.

Prpfoss6rßa^,PrPfessorbf Chemistry at the c Bbyal? A.cademy», hasimade a great practical discbfery. He has dis-" cbvered how tatteat iron vessels so ks to. render ; th6My safp; frpm the tendency to rust-, sp that, [boilers,; if ; the iron of which th6y "are; made had been thus tre;atedi w rosion'causedy by^the water; and cooking vessels w.PulH\rioldiiger need either t tbT&b ma^e bf-^bgpe^pr fufriished with ': a tin- liciiffg ; : 'While knd rails, atid; irbri^els MS^plstfeSi arid the locoi | naotives^rii&i^ b'bunt- - fife's^ iron inStrtiniefftl aroTirmbaern life, • would be safe against the most destrucV tiye of dll-tjie agenOjie^^ich waste them away. .TEe prjocess^' tp, coat the iron with the magnetic or black'bxide of iron, which is ; ript 9nlys jncapable of rust, but harder than tlie jrbri "itself, and whibh adherMto the iron withatenacity greater . than that. wit)i r whieh the. various strata 'of the iron adner^ .•together. Professor - : BarfE sußje6ts\ the: irbn r to Mpeifheated steam at a teinperature^ of from 50Odegs. to l^degl^F^rierihjeife'and if thjer exposure is cpntinTied for from five ; to seven hours, IhiS cbatirigiWll be fairly formed? and if the fatter iteniperature be secured, it ; will adhere so closely that not even a file will sdrape it pff. Pro^ fessbr Barfflbf^irpn vessels thus treated out bri^the lawu^jEo^ six weeks during the - late rainy weaither, arid when brp^glitu;^' Mey j^were -as -'bright as; before their". e^bsureV; The coating dbes riot affect; the surf ace,'except by turning it black. If the surface were rough ■before:! it will fbelxough" still, and if polished before} it will be polished still-. If br ; m case . the magnetic' oxide . is detached m parts^ willjthe rust which then begins on the exposed iron; spread underneath : the magnetic' oxide: On the contrary} the codt clings so cldsej thatl though tHe" rxist will ,c.at; mtb tlie irori&t ari^ exposed 'part;;, it /will riot ;. extend lateriiUy td the lrbri still bodted by the' magnetic; oxidei ;• ;