ISO12944 - AkzoNobel

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ISO12944Corrosion protection of steel structuresby protective paint systems

What is ISO12944?ISO12944 is the industry standard for corrosion protection of steel structures by protective paint systems.Originally released in 1998, the standard is put together by representatives from key countries and companiesinvolved in the protection of steel structures to build a mutually beneficial standard.The standard is designed to provide guidance to architects, engineers, specifiers, applicators and otherparties in the application of coatings to steel.The standard covers 9 parts with key components of the standard covering environment classification,protective paint systems, laboratory test methods and systems and test methods for offshore structures.What has changed inthe 2018 edition of thestandard?In the latest release there are a number of significant changes to the standard.These changes are:1Changes tocorrosioncategoriesThe old C5-I and C5-M categories have been replaced with C5 for harsh onshorecategories and by CX for offshore categories. CX is taken care of in a new Part 9.There is also the addition of a fourth immersion category, IM4, which covers immersedstructures in sea or brackish water which are protected by cathodic 1Very LowHeated buildingsDry or cold with very low pollutionC2LowLow levels of pollutionTemperate low pollutionC3MediumUrban and industrial atmospheres, moderate pollution orlow salinityTemperate, medium pollution,tropical low pollutionC4HighIndustrial areas or coastal areaswith moderate salinityTemperate with high pollution,tropical with moderate pollutionC5-IVery HighIndustrial, high humidity, aggressive atmosphereN/AC5-MVery HighCoastal and offshore areas withhigh salinityN/AC5Very HighN/ATemperate and subtropical with very highpollution and/or significant chloride effectsCXExtremeN/AExtreme industrial areas, offshore areas,salt sprayIM1Fresh waterRiver installations and hydroplantsRiver installations and hydro plantsIM2Sea or brackish waterHarbour areas with structuresand offshore structuresImmersed structures without cathodicprotectionIM3SoilBuried structuresBuried structuresIM4Sea or brackish water withcathodic protectionN/AImmersed structures with cathodicprotection

2Changes todurabilitycategoriesThe low, medium and high categories remain but they are joined byvery high. The durations which these categories relate to have alsochanged with low durability now up to 7 years and the new veryhigh category relating to 25 years plus.Durability Category12944:199812944:2018Low (L)2-5 yearsUp to 7 yearsMedium (M)5-15 years7-15 yearsHigh (H)More than 15 years15-25 yearsVery High (VH)-More than 25 years3The dry film thicknessesand paint systemsnow include minimumnumber of coats percoating type or technology and specify aminimum dry film thickness for the totalsystem per corrosion category. See thecoatings systems on page 5 or 6 to seewhich systems to specify. The standardnow also includes the capacity to acceptnew innovative coating technologies ifperformance can be demonstrated by 3rdparty testing and field trials.4Changes tolaboratorytest methodsCategoryC2C3Changesto paintsystemsUp to C4 high the test methods have not changed. However for C4 very high, C5high and C5 very high, cyclic testing has been introduced to better replicate in-fieldconditions.Low ( 7 yrs)Med (7-15 yrs)High (15-25 yrs)Non-cyclic TestingDurations as 1998(E) revisionISO 6270 / ISO 9227Non-cyclic Testing:Linear Durations TBCISO 6270 / ISO 9227As C5 High. Phased cyclictesting: 10 cyclesC4C5Very High (25 yrs)Non-cyclic Testing Durationsas 1998 (E)Phased introduction of ISO 12944-9Cyclic Testing: 10 cyclesNon-cyclic Testing valid for 5 yearsImmediate introduction ofCyclic Testing: 16 CyclesISO 12944-9

Why has cyclic testingbeen introduced?One of the major changes in the newest revision is the addition of cyclic testing for systems operating inenvironments of C4 very high and above. AkzoNobel welcomes this addition to the standard, having foundover many years that cyclic testing is more representative of real-world corrosion conditions.The following charts show testing of three coating systems on long-term static salt fog testing and on arange of cyclic test methods against an in-service field trial. As can be seen from the graphs, systemsperforming well on salt fog testing do not show equivalent performance to those on cyclic testing or underreal world conditions. For real world conditions we used our external weathering site at Blyth, UKCorrosion creep of zinc-rich primed systemsUsing salt fog test (4032hrs)System 1System 2System 30123Corrosion creep (mm)Corrosion creep comparison of zinc-rich primed systemsNorsok M-501 ASTM D5894 Draft NACEISO 20340Blyth (3 Yrs)Using cyclic testing methods01234Corrosion creep (mm)5674

A selection of ourthird-party certified systemsIn conjunction with extensive in-field performance assessment, AkzoNobel commissions testing programsat third-party houses to certify systems for use in the most commonly specified environments. In additionto the systems listed below we have tested a range of new and innovative products to the new revisionof the standard. To gain a full listing of third-party certified systems please contact your local AkzoNobelrepresentative.C3EnvironmentCoat 1Coat 2C3 MediumIntercure 4500 @ 150µmC3 HighIntergard 251HS @ 130µmInterthane 990 @ 50µmC3 HighIntergard 251HS @ 150µmInterthane 990 @ 50µmC3 HighIntercure 4500 @ 180µm*C3 Very HighIntergard 251HS @ 190µmC3 Very HighIntercure 4500 @ 240µm*Interthane 990 @ 50µmC4EnvironmentCoat 1Coat 2Coat 3C4 MediumIntergard 251HS @ 130µmInterthane 990 @ 50µmC4 MediumIntercure 4500 @ 180µm*C4 HighInterzinc 52 @ 60µmIntergard 475HS @ 90µmC4 HighIntergard 251HS @ 190µmInterthane 990 @ 50µmEnvironmentCoat 1Coat 2C5 MediumIntergard 251HS @ 190µmInterthane 990 @ 50µmC5 HighInterzinc 52 @ 60µmIntergard 345 @ 160µmC5 HighInterzinc 52 @ 50µmIntercure 4500 @ 200µm*C5 HighInterzinc 52 @ 60µmIntergard 475HS @ 140µmC5 HighInterzinc 52 @ 50µmIntercure 4500 @ 210µm*C5 Very HighIntershield 4000USP @ 150µmIntergard 475HS @ 150µmInterthane 990 @ 60µmC5 Very HighInterzinc 52 @ 60µmIntergard 475HS @ 200µmInterthane 990 @ 60µmC5 Very HighInterzinc 52 @ 70µmIntercure 4500 @ 250µm*Interthane 990 @ 50µmC5* System tested with reduced coats as per innovative coatings technologies clauseCoat 3Interthane 990 @ 60µmInterthane 990 @ 60µm

Part 9The introduction of Part 9 to the ISO12944 standard introduces the old ISO20340 standard into ISO12944.Part 9 mandates the use of cyclic testing for offshore structures. In previous editions of the standard offshorestructures were referred to as C5-M however a new environmental category, CX, has now been introducedfor all offshore structures.All offshore systems must continue to go through 4,200 hours of cycling testing, which equates to 25 weeks.Part 9 sets both the minimum number of coats and minimum film thickness per system, with some changesfrom the previous standard’s requirements for C5-M. The table below outlines the requirements for steelsubstrates.CategoryCXSplash & tidal zonesIM4Primer coatZinc (R)Other primersZinc (R)Other primersOther primersNDFT (µm) 40 60 40 60 200- 150MNOC3333212NDFT of system (µm) 280 350 450 450 600 800 350One of the main changes in ISO12944 Part 9 from ISO20340 is in the performance criteria on corrosioncreep – this now states that coating systems for high impact areas shall be less than or equal to 8.0mm andall other CX applications less than or equal to 3.0mm. Sea water immersion now states 6.0mm pass criteriaand there are slight changes to adhesion as well.Please contact your local AkzoNobel representative for ISO12944 Part 9 systems.international-pc.comThis document is not intended to be a comprehensive review of all changes to the standard, contact your localAkzoNobel representative for additional detail.AkzoNobel has used its best endeavors to ensure that the information contained in this publication is correct atthe time of printing. Please contact your local representative if you have any questions. Unless otherwise agreedby us in writing, any contract to purchase products referred to in this brochure and any advice which we give inconnection with the supply of products are subject to our standard conditions of sale. Registered trademark of AkzoNobel in one or more countries. 2019 Akzo Nobel N.V.10019 / 0920

ASTM D5894 Draft NACE ISO 20340 Blyth (3 Yrs) A selection of our third-party certified systems In conjunction with extensive in-field performance assessment, AkzoNobel commissions testing programs at third-party houses to certify systems for use in the most commonly specified environments. In addition

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