Document 3eJXREmnXo9qrbmqgR49LOGgJ

i f a r. E' f ! I .PUUHH'iWUPMM iV.in i i MiaiaalMM; * hand Paint Galvanized Surfaces? Somr plant* do. Some don't; they're aatieficd juat to let galvanised roof* and idinf> weather. But here are three good reatom to paint--pin* a lot of bow. TEEUNC FAINT o galvaaiad tut) wrfacct h i common head, ache to maintenance me*. Root* tod tidiagi to a/fected act only am unughily, but aho go k> pot nor* qaktlyWhy do ihoe wrfacea pad? b there any w.y to avoid it? Why bother to put a phiaint torfaca at air Lett dnpotc at that lilt qunlun Inj: It realty reel accrnary lo paiat the gahamerd rttcriore at ordinary pbnt Suldiap tar protective pur- povet when new. Nor eves after th* tpao dean appearance it duDed by 6 inotuht' weathering. This weath ering it normal act* further aa * protective film foe the revt at th* life of the galvanised coating. O** authonty vayt bare me coauap of 2 ounert per vqture loot of mrfae* will latt 14 to Jl yean in urbaa al- movphcm. and 40 to SO yean Ik purer couatry air There bif wbyh--There are three main iravtun foe paintia| galvanised Mirfacca: ... Fmtrprmanct--A weathered turface admittedly it ate attractive, and may mar the appearance of an otherwtv* well-painted pbnt. And if the plant purturt a definite color tcherne. the need lor painting la Vwi. On the other hand, tranv- mituon towert for utility power luiet--which are mnatty galvaniad --are rarely pamled ... Fi turn--Sometime* veveir almovphenc cnnditioot polity a protective coat of paint, evee loe tranvmivvion towert Such condt. liont will tint mndly In plant I*, tenon or ut the vicinity of procew pbiitv that male the local ait highly conouve. Yoe may tvl: Why gatvioiae at all If you're going to add a prowc- live coating'* Anvwec It multiple* th* protaction Under equal condh Horn a galvaniaad covering uvuatty Slmft.iid be UA* MOUfTMt AUOOAnON, 4M UvUre* 4mm, Mm Ter* If, M. T. wm iWPWWWWWPgWfiinWIP LWippBWiHPBHWI^WWW^PBpwJPBBjjpjpwppppi^pjppppippwp LI *0 7152 ... ..... ... ... .... .j,--,... ---.. *-.: ' ---- ....................... - ............ . Ml nine it- urn i i .......... giver looter ruit-reihtanl protect** bonne reaction that may occur. But manufacturer. They all include red to tuel than norma) coat of paint. there't a question at to whether the lead at a pigment became of Ha rtnt But a coat o< paint added over gnl- matimum hla of turfece protacOoa inhabiting properties - - -- ------ vanned Keel wtU (ready inerta* it obtained thin way. Alto, painting In bnef, here a bow to nan it-- : the protect**. the uructurc later ututlly involve! on either old or new surfaces: Here's another kind of paint pro higher ctnti becaute the turface mutt UA. 9-/--for tingle coni oa tect** that'i needed. Galvanized be cleaned. And tometunca cow at ahedi or buddmp where protaction ; turfacn thouId be painted (when rigging and covering la greater once b important, appearance aacondary. ~~ new) whenever there't a threat o< the plant b operating. Hat a linseed od-alkyd vehicle, wei i galvanic corrouoo. Tha can occur The second method caOt for ape- tuned for rutty turfacre became of wherever aurfacea over! J or come citl pre-treatment of the new gal fit wetting qualities. in contacl with supporting tied vanized turface to improve Hi UA. 9-2--for a tingle coal )oh, framework. Sometimes. at in the adhetive qualities. Traditional waya timilar to Na I. but tiling a Uttar cate of both or wrapt, tuch ttirfacee have been to etch H with a mild add, drying itraigbt ilkyd vehicle. Good are kept apart by dielectric watben tuch at hydrochloric acid Hi toluol for new, prt-treated aurfacea. . or inwlauni gaskets. and alcohol, or totk H with aolu- UA. 9-i--timilar to No. I, bat ,.. For *pir*p--Tbit could be tiont of acetic acid, nitric acid, aal with green tint. the cate oI an unpainted (charmed soda, and umitar chemicals UA. 9-*--tor urn ae primary roof or tiding--or even a tranamia- How well have any of their etch coat to be followed by atop coal. tioo tower---that bad reached the ing pre-treatmenta worked? There Same vehicle aa Na f. point in yean at lervicc where a are vinous ahadea of opinion--none UA. 9-5--Similar w Na 4, ancoal oI paint would tavt it for con too glowing. According to a leading cept tame vehicle aa Na 2. tinued useful tenrxx. authority, the Steel Structure! Paint There new development! in paint! Why dee* (del peel? One reatoa ing Council, multt hate been only do not eliminate the need tor pre- only--on any kind of turface: lack of tdhnuw Adhesion ta obtained in two way*: by molecular attrac tion to the metal, and by mechanical anchor. Clud culprit m destroying the bond it moisture. It't the tame with painted galvanaed turfacev Without tpcctai meature* of turface preparation, moisture and air (oiy|en and car bon dioxide) will penetrate the coal of paint to the (aharmed turfacc. Here the moivturc will react chemi cally with the zinc to produce the normal product! of comnion, tuch at zinc otidet and carbonates. Thtt alto deterrbet the weathering proccta on hare galvanized surfaces But when coated with paint, the zinc oaidet and carbonalet combine fair it bcw. in fact, the Council daunt that tometnnea the treat ment! have drwroyed the zinc coal ing altogether, (but accelerated the common of the structure. In gen eral. mow everyone agreca there hat never been complete tatnfaction with the acid-washing technique. Realizing Ihit fact. L1A. (Lead InduWnet Attoctai**) devoted two yean to Wudy H. W hat w needed, H concluded, were both an effective method of pre-treatment and a new kind of paint. At a reuzh of rti rctearch and lewt, H hat recently announced a tenet of five new paint formulation! to wit the varioua prob lem! of application. Thne formulationt--LI A. 9-1 to 9-S--can be made up by any competent paint treaimcnt of new gzhuiief tarfacet. But teveral autboritiaa raoommend a pre-treatment wide a phosphate or chromate preparation, rather than by the dubious "etch ing" procedure. The Steel Struc tures Painting Council tuggetb non flammable hquad zme phosphate, ap plied by brushing, spraying, or in aa industrial washer. In tcctioa 6.7 of Ht Specification MIL-Z-17I7I the U.S. Navy says phosphate or chro mite lieatmcnt will rttrnd the Ufe of nnc-coated articles, provide aa eaccllent pre-treatment for painting. The LI A. claims that treatments with copper sulphate, acetic acid, or hydrochloric acid are ineffective on new galvanized Wed aurfacea But phosphate cleaning prevent! the with the fatty acidt in the paint oils. chemical react** with fatly acids ta Remit it a chemical toap film that paint cab by coating the (atvaniaad lootent the paint bond. Thu re surface with a fine, crytullina layer action progressively weaken the of inert zinc phosphate. If salts are zinc coating. So mwead of protect formed, they doal coma in contact ing the turftea. the paint hastens Ha with punt oib. LtA. further Wntaa decimetre*. t*iat pnotphale Ireatmcsta effectively Hew le avoid petting--All da- roughen the zinc surface, improve pendt whether you have to paint adhesion. new or old galvanized surfaces Two SKpa In pre-treatment, LIA. methodi of painting ere pottibia. point! out, are simple: In one. the galvanized turface b al ... Clr-- zwfere--Remove el lowed to weather for three to ala (ream. Scrub lightly with fleet woof momhi before palming. Tbit worka to capote true metal turtles. fairly weft at far at good paint ad- .. - Apply *4*1we -- Blush or hrtioe h concerned Nobody teemt spray uniformly un (Waned surface. to know for ture why paint will tlkk A protective coating will fotm in altar weathering Beal antwtr b one to two minutes. that weathering provide! enough me COMOMUN. I'icWfuJr of ga'-iMnd .,. H ath ihr routing with cold chanical adhewm to counleibalance roof of ftMnmo thuwg hew pw**1> water, with tpunpe, rag, or hose. Al the bad eftecu of toy oaide or car- fim4 frnm Mol tMf low to dry. fiapriMen from FACTOfiV MANAGtMtNT ANO MAINTtNANCI AMU. IfM Crer1^. Ias*. UitvM r-saU-eCa- ta., IN W-- IIUK n -- Vw 4RH..