b'Methods of Corrosion ControlDependinguponthecorrosionpotentialfora TheAmericanGalvanizersAssociationgivensoil environment, severalalternativesare discussedintheirpublication,ZincCoatingsavailabletoreducethecorrosioncycleand thatwhencomparingzinccoatsproducedbyextend the performance life of the underground differentprocess,thethicknessofzinccoatingsteelelement.Thesecontrolmeasurescanbe cannot be used without considering the amountdivided into general categories: of available zinc per unit volume.The coating Passive ControlUsed in soils classified as densitiesofdifferent typesofzinccoatingcanhaving mild to moderate corrosion potential differ.So given the thickness representing the ActiveControl Usedinsoilsclassifiedas same weight per unit area would be expected tohaving moderate to severe corrosion potential provide equivalent service lives.Passive Control Hot Dip Galvanizing to ASTM A123-Grade 75HotDipGalvanizing:Theproducts providesa3.0milcoating,1.7oz/ft 2 ofzinc.manufacturedbyEarthContactProductsand Continuousmillgalvanizedsheetmaterialtoofferedwith HotDipGalvanizingarecoated ASTM A653-Class G90 specifications provide awith molten zinc that contains not less than 98% 0.76 mil per side coating, 0.45 oz/ft 2of zinc perpurezincmetal.Thehotdipgalvanization side.While one might think that per side coatingprocess meets or exceeds ASTM A123 Grade 75 thicknesswouldalwaysbe0.45oz/ft 2 ,thewhichis1.7oz/ft 2 ofzinc(3.0milsminimum ASTMA653G90specificationallowsforthickness) for steel plate, structural tubing or bar galvanized coating to be unequal per side.Theproducts specificationacceptsaminimumonesidecoating of 0.32 oz/ft 2as acceptable.As a resultContinuousSheetHighSpeedHotDipMill corrosionlifecouldvarybetweenmillrunsofGalvanizedCorrosionProtection:Thepier G90 material.pipeforECPSteelPiersfoundationsupport When making a comparison of corrosion life vs.systemsaresuppliedwithaASTMA563G90 thickness of zinc, the ASTM A654 G90 coatinghot dip galvanize process that is applied prior to offeredupto20%ofthecorrosionlifewhentubeformation.Thiscorrosionprotection comparedtoHotDipGalvanizedproducttoprocess treats both sides of the steel sheet with a ASTM A123-100 under similar conditions.high speed continuous galvanization process thatconsists almost entirely of pure zinc.During the Because no controlled in-soil corrosion testing isprocessthesteelsheetispassedthroughthe availableforthecontinuoussheethighspeedcleaning tanks and then into the zinc kettles at pre-galvanizecorrosionprotectedpierpipe,ahighspeed.Thespeedthroughtheprocess zincequivalenceof0.76mils(0.45to0.32determines the coating thickness of almost pure oz/ft 2 ) on one side appears to be reasonable valuezincwithverylittleintermetallicgrowthof to be used when estimating corrosion life the acrystals. This corrosionprotection coatinghas pier pipe fabricated from the high speed hot dipsufficient ductility to withstand the tube forming pre-galvanized sheet steel.process without damage to the coating. Thickercoatings(5mils)usedinfieldtestingThe pier pipe used for PPB-350 and PPB-300 haveshownextendedlife,dependingontheSteel Piersis supplied with ASTM A563 G90 corrosion potential of the soil environment.Thehot dip mill galvanization. galvanized coating serves as an anode to provideIn the case of the G90 corrosion protection the cathodic protection to the steel. The results oftotalthicknessofbothsidesisspecifiedata thestudiesconductedbyRomanoffandbyminimum of 0.90 oz/ft 2or nominally 0.45 oz/ft 2 Porterindicate thatagalvanized(zinc)coatingperside.Themaximumthicknesspersideis was effective in delaying the onset of corrosionapproximately0.76mils.TheASTMA653 intheburiedsteelstructures.Typicalconclusions drawn from this study for the 5 milspecification allows variations in thickness from (3 oz/ft 2 ) galvanized coating includes:one side of the steel sheet to the other side. TheAdequate for more than 10 years corrosionminimumthicknessallowedpersideis0.32oz/ft 2 . protection for inorganic oxidizing soils.ECP Technical Design Manual Corrosion Life2021 Earth Contact Products, L.L.C.2021-09 Chapter 8 - Page 152 All rights reserved'