. Journal . Fio. 3.—Photomicrograpli of zinc-iron alloy. 400 COLES—VAPOUR-GALVANISING. tAprU 30. galvanised iron when subjected to Preeoes test is dueto the protection of the zinc by the deposited copper,thereforf, experiments were made with a solution offerric Bulphuto. which dissolves zinc without forming aprecipitate on the zinc coating. To test this, knownareas of vapour-galvanised and hot-galvanised platewere exposed to the action of ferric sulphate solutionfor an equal period and the amount of ferrous salt formetlbv the reducing action of the zinc determined. Thecolumn headed Weig
. Journal . Fio. 3.—Photomicrograpli of zinc-iron alloy. 400 COLES—VAPOUR-GALVANISING. tAprU 30. galvanised iron when subjected to Preeoes test is dueto the protection of the zinc by the deposited copper,thereforf, experiments were made with a solution offerric Bulphuto. which dissolves zinc without forming aprecipitate on the zinc coating. To test this, knownareas of vapour-galvanised and hot-galvanised platewere exposed to the action of ferric sulphate solutionfor an equal period and the amount of ferrous salt formetlbv the reducing action of the zinc determined. Thecolumn headed Weight of zinc dissolved °-™° ?»»relative corrosions:— Fio. 4.—Uas-beatcd furnace tor small articli*.ooated, or by addmg finely-divided carbon to the zinc it was at one time thought that zinc dust containingcarbon might have a detrimental effect on the natureof the deiwsit. due to the retention of small portionsof carbon setting up galvanic action in the presence ofmoisture; the mieroseoiw did not reveal any particlesof carbon on the zinc surface. The carbon required forreducing anv excess
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
