| OCR Text |
Show WHAT IS GALVANIZING? Galvanizing of wire and flat steel consists In tho protection of either by a contlng of zinc. This Is dono by passing tho wlro or flat stool, when proporly cioanod, through a bath of molten zlno or spelter. Thoy aro nover passed through tho zlno bath more than onco, becauso to pass them through the second time would melt I off the first coat of zinc put on. Tho B terms doublo galvanized nnd triple B galvanized, are, thereforo, entirely B misleading, becauso no doublo or trl- B p!e galvanized wlro or flat steel Is fl made. B A uniform coating of zinc applied B so as to avoid baro and thin spots-is B far mora desirable than a heavy un- B even coating with portions of tho surface poorly protected. The zlno fl must bo applied al the proper tern- fl porature and under sultablo condl- H tlons In order to secure tho greatest fl possible bond or adhesion between fl tho wlro or flat steel and tho zinc cov- H cring. Tho zinc coat must be as flex- fl lblo so as to avoid cracking or peel- lng whllo wlro Is being manufactur- ?-ed ?-ed Into woven wire fences or colled up In tho roll for shipping. , Tho zinc galvanizing coat protects hejiuffaco from rust not only becauso be-causo it acts as a covering, but moro especially becauso there Is nK" electrical elec-trical relationship between tho zinc nnd steel that causes tho zinc to exorcise ex-orcise n preserving Influence. Zinc Is practically tho only Bultnb!o metal which Is electro positive to steel. When zinc nnd steol nro put together zinc becomes tho oloctro posltlvo and steel the electro negatlvo body. The oxygen ot tho air which Is tho destroying de-stroying element, always tends to nttack tho electro negative substance. Tho oxygen of the nlr has llttlo or no effect upon zinc. In properly galvanized gal-vanized wire or flat steel, therefore, tho oxygon Is always harmlessly working upon or tending to destroy tho zlno coating nnd Is leaving nl-most nl-most freo from attack tho steel, that is tho electro negative substance. Tho great steel companies at nomn nnd abroad havo dovotod many years to scientific Investigation and to research re-search on this subjoct and aro now nblo to exactly detormlno tho proper prop-er speed tomprnturo, etc., that should bo tiBed In galvanizing each dlffdrcnt slzq of wlrq of flat etcel In'order to Becuro tho very best results. |
