A wide-range variable gas flowmeter

✍ Scribed by Bradford, B. W.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1933
• Weight: 246 KB
• Volume: 52
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000521703

✦ Synopsis

of Iliffcreiit,iiil ticration. Tlic clinnging conditions nre illustrntctl in Fig. 5. A whitc corrodcdn rcn first appcnrs nloiig tlic bottoni of the plntc (a), jnst tlic placc ivlicrc onc \voiilil esiicct, the osygcii to Lccoiiic csliaustctl first. .Lliis iiren I)cconics iiiiotlic, nnrl zinc ions dissolvc ns zinc cliloritlc. 'l'he u p p r portion of tlic slicct, i.e., from thc wirtcr lcvcl rlo\mwnrtls, Ijccoiiies c:it,liotlic nntl ovcr its surfiice is forincd ii lnycr of caustic nlknli. \Vhcrc tlicsc two rcngciits iiicct zinc Iiydrositle is prcciiiitiitctl in tho gclntinoiis form. The corrosion, howcvcr, is not coiifined to tlic ~J O t t O l l l Iiiycr, for tlic ciivity cffcct conics in e:cii \vlicre tlic Ijiilk surfiice is qiiito wcll ncrntctl, and, in nccortliilicc with wlint lins nlrcntly bccii ilisciisscd, zinc hytlrositlc is ng:iin I)rccipitntcrl n t tlic niout,lis of tlic cnvitics. l'licn t.lic) sheet \ v n ~ 1iorizoiit:il thc Iicirps of zinc hytlrositlo itre uii:iffectccl, hiit when thc slicet is verticiil tlicy flow slowly ant1 surely downwnrds and tlic corroded nren rescnilrlcs tlint in (6). A s the iniincrsion tinic increases tlic nppciirnncc of the slicet grntlunlly bcconies that. shown in (c), \.lien no furtlicr chiinge occurs. This typc of corrosion, ngriin, is of more thnn tlicorcticnl iutcrcst,. A case lins bccii reported where tlic inctril ~s~iills of II giisomctcr suffcrcd inteiisc corrosion, Icntliiig to nctuiil ~~crftiriitioii, ovcr tlint, part of tlic iiictnl f l n CORRODED AREAS SHADED FlC.