【AS澳大利亚标准】AS NZS 3750.9-2009 Paints for steel structures Part 9 Organic zinc-rich primer.doc

as/nzs 3750.9:2009as/nzs 3750.9:2009australian/new zealand standardpaints for steel structurespart 9: organic zinc-rich primerthe standard is downloaded from standard sharingas/nzs 3750.9:2009this joint australian/new zealand standard was prepared by joint technical committee ch-003, paints and related materials. it was approved on behalf of the council of standards australia on 16 march 2009 and on behalf of the council of standards new zealand on 27 march 2009.this standard was published on 20 april 2009.the following are represented on committee ch-003:austroadsaustralasian corrosion associationaustralian paint approval schemeaustralian paint manufacturers federationaustralian pipeline industry associationbusiness new zealandengineers australiainstitution of professional engineers new zealandmaster painters australiamaster painters new zealand associationnational association of testing authorities australiawater corporation western australiakeeping standards up-to-datestandards are living documents which reflect progress in science, technology and systems. to maintain their currency, all standards are periodically reviewed, and new editions are published. between editions, amendments may be issued. standards may also be withdrawn. it is important that readers assure themselves they are using a current standard, which should include any amendments which may have been published since the standard was purchased.detailed information about joint australian/new zealand standards can be found by visiting the standards web shop at .au or standards new zealand web site at www.standards.co.nz and looking up the relevant standard in the on-line catalogue.alternatively, both organizations publish an annual printed catalogue with full details of all current standards. for more frequent listings or notification of revisions, amendments and withdrawals, standards australia and standards new zealand offer a number of update options. for information about these services, users should contact their respective national standards organization.we also welcome suggestions for improvement in our standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. please address your comments to the chief executive of either standards australia or standards new zealand at the address shown on the back cover.this standard was issued in draft form for comment as dr 06352.as/nzs 3750.9:2009australian/new zealand standardpaints for steel structurespart 9: organic zinc-rich primeroriginated in australia as as 22041978. previous edition as/nzs 3750.9:1994. second edition 2009.copyright standards australia/standards new zealandall rights are reserved. no part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.jointly published by standards australia, gpo box 476, sydney, nsw 2001 and standardsnew zealand, private bag 2439, wellington 6020isbn 0 7337 9123 93as/nzs 3750.9:2009the standard is downloaded from standard sharingprefacethis standard was prepared by the joint standards australia/standards new zealandcommittee ch-003, paints and related materials, to supersede as/nzs 3750.9:1994.the objective of this standard is to provide requirements for organic zinc-rich priming paint intended for use on iron and steel structures. it forms part of a series of product standards for paints referred to in as/nzs 2312, guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings. this edition has been reformatted and takes account of revisions to standards such as as/nzs 2312 and the as 1580 series of test methods.the following standards in this series have been published: as2364paints for steel structureshigh build epoxy (two-pack)2672paints for steel structureschlorinated rubber, high build2673paints for steel structuresalkyd/micaceous iron oxide2674paints for steel structuresepoxy primer (two-pack)3750paints for steel structures3750.1part 1: epoxy mastic (two-pack)for rusted steel3750.2part 2: ultra high-build paint3884etch primers (single pack and two-pack) for pretreating metal surfaces3885paints for steel structuresgalvanized and zinc primedlatex3887paints for steel structurescoal tar epoxy (two-pack) as/nzspaints for steel structures3750.3part 3: heat-resistingexterior3750.4part 4: bitumen paint3750.5part 5: acrylic full gloss (two-pack)3750.6part 6: full gloss polyurethane (two-pack)3750.7part 7: aluminium paint3750.8part 8: vinyl paintsprimer, high-build and gloss3750.9part 9: organic zinc-rich primer (this standard)3750.10part 10: full gloss epoxy (two-pack)3750.11part 11: chlorinated rubberhigh-build and glass3750.12part 12: alkyd/micaceous iron oxide3750.13part 13: epoxy primer (two-pack)3750.14part 14: high-build epoxy (two-pack)3750.15part 15: inorganic zinc silicate paint3750.16part 16: waterborne primer and paint for galvanized, zinc/aluminium alloy- coated and zinc-primed steel3750.17part 17: etch primers (single pack and two-pack)3750.18part 18: moisture cure urethane (single-pack) systems3750.19part 19: metal primergeneral purpose3750.20part 20: anticorrosive metal primersolvent-bornelead and chromate free3750.21part 21: undercoatsolvent-borne3750.22part 22: full gloss enamelsolvent-borne3750.23part 23: semi-gloss enamelsolvent-bornethe terms normative and informative have been used in this standard to define the application of the appendix to which they apply. a normative appendix is an integral part of a standard, whereas an informative appendix is only for information and guidance.contentspagesection 1 scope and general1.1scope . 41.2referenced documents . 41.3definitions . 41.4classification . 41.5colour.4 1.6safety precautions . 5section 2 material requirements2.1general . 62.2pigment . 62.3conditions of test. 62.4liquid paint. 62.5application properties . 72.6applied film . 7section 3 packaging and labelling3.1packaging. 103.2labelling . 10appendicesapurchasing guidelines. 11binformation on the use and application of organic zinc-rich primer . 12creferenced documents . 15dpreparation of test panels . 1615as/nzs 3750.9:2009the standard is downloaded from standard sharingstandards australia/standards new zealandaustralian/new zealand standardpaints for steel structurespart 9: organic zinc-rich primers e c t i o n1s c o p ea n dg e n e r a l1.1 scopethis standard specifies requirements for an organic zinc-rich primer intended to protect iron and steel against atmospheric corrosion. it is suitable for application by brush, or spray.notes:1type 2 paint specified in the standard is referred to in as/nzs 2312 as paint referenceno. c02.2type ii paints may be used as detailed for systems acl2, acc2-6, ehb4, ehb6, psl1, pur4, pur5 and pur7 in as/nzs 2312.3appendix a contains recommendations and advice on information that should be provided by the purchaser at the time of enquiry or order.4additional information on the use and application of organic zinc-rich primer is provided inappendix b.1.2 referenced documentsa list of the documents referred to in this standard is contained in appendix c.1.3 definitionsfor the purpose of this standard, the definitions given in as/nzs 2310 and those below apply.1.3.1 organic zinc-rich primera material consisting essentially of a dispersion of metallic zinc dust in an organic medium.1.4 classificationorganic zinc-rich primers shall be classified as follows: (a)type 1a single-pack primer.(b) type 2a multi-pack primer that hardens by reaction of its constituents after mixing.1.5 colourthe colour of the product is usually characteristic of the zinc dust pigment, but to overcome the difficulty of differentiating between a coat of paint and a freshly prepared surface, the product may contain suitable tinting pigments.note: the product may have differing shades according to the application conditions.copyright1.6 safety precautionsorganic zinc-rich coatings may contain reactive chemicals and flammable solvents which may present a risk to users. the manufacturers material safety data sheet (msds) should be adhered to.personal protective equipment, as recommended by the manufacturers msds, should be worn during mixing and application.users need to be aware that due to the weight of zinc dust incorporated into these products, consideration needs to be given to manual handling of heavy containers.the standard is downloaded from standard sharings e c t i o n2m a t e r i a lr e q u i r e m e n t s 2.1 generalthe paint shall comply with the requirements detailed in clauses 2.2 to 2.6 inclusive. these properties and requirements are summarized in table 1.2.2 pigment2.2.1 pigment contentthe total zinc content of the non-volatile content shall be not less than 85 percent by mass or greater than 94 percent by mass.2.2.2 pigment constituentsthe zinc dust pigment shall comply with the following compositional requirement by mass: total zinc (as zn) . 98 percent min. metallic zinc (as zn) . 94 percent min. total lead (as pb) . 0.2 percent max. total cadmium (as cd) . 0.1 percent max. total iron (as fe) . 0.05 percent max. arsenic (as as) . 0.0005 percent max.note: the zinc oxide content may be calculated as the difference between the total zinc contentand the metallic zinc content.2.2.3 particle sizethe particle size of dry pigment shall be such that not more than 0.1 percent by mass is retained on a 75 m test sieve complying with as 1152.2.3 conditions of testunless otherwise specified in this standard, the following test conditions shall apply:(a) the test panel material and its preparation shall be in accordance with appendix d. (b)the type and size of test panels shall be as specified in table 1.(c) the dry film thickness shall be 50 m to 85 m.(d) conditions for testing shall be in accordance with as/nzs 1580.101.5.(e) conditions for air-drying shall be in accordance with as/nzs 15.4 liquid paint2.4.1 condition in containerwhen examined in accordance with as 1580.103.1 at the time of delivery from the manufacturer or supplier, the paint shall be free from gel, coarse particles, skins and foreign matter. the product shall be readily re-incorporated when tested in accordance with as/nzs 15.4.2 volume solidswhen determined in accordance with as 1580.301.2, the volume solids shall be within 5 percent of the manufacturers specification.2.4.3 storage properties degree of settlingwhen stored at 23 3c in sealed, unopened containers for 6 months from the date of manufacture, the rating for the settling whendetermined in accordancewith as/nzs 1580.211.1 shall be not less than .2 re-incorporation after storagewhen stored at 23 3c in sealed, unopened containers for 6 months from the date of manufacture, and tested in accordance with as/nzs 1580.211.2, the paint shall be readily re-incorporated and be of uniform consistency free from lumps, gel and other defects.2.4.4 freedom from coarse particlesafter manual stirring of the product or its components, any undispersed aggregates retained on a 150 m test sieve complying with as 1152 shall not exceed 0.5% by mass of the total product.2.5 application properties2.5.1 generalwhen applied in accordance with the manufacturers recommended methods of application, the applied film shall be free from defects when tested by the appropriate method (see clauses 2.5.2 to 2.5.4). the dry film thickness shall be 5085 m, obtained by brushing, or spraying.note: it is only necessary to demonstrate those methods of application that are recommended by the manufacturer for type 1 or type 2 products.2.5.2 brushingwhenappliedto avertical test panel(see clause 2.3)in accordancewith as/nzs 1580.205.1, the test paint shall exhibit satisfactory brushing properties and be free from visible defects.2.5.3 sprayingwhen thinned, where necessary, and applied to a vertical test panel (see clause 2.3) in accordance with as/nzs 1580.205.2 or as/nzs 1580.205.4 as appropriate, the test paint shall exhibit good spraying properties.2.5.4 pot-life assessment (type 2 products only)using the equipment, coating system and maximum dry film build nominated by the paint manufacturer, when tested in accordance with as/nzs 1580.205.2 or as/nzs 1580.205.4, the paint shall produce a film that is free from sags, runs, pinholes and craters. these requirements shall be met within 15 min of initial mixing of the paint and again at the expiry of the nominated pot-life.note: see paragraphs b8 and b9 of appendix b.2.6 applied film2.6.1 surface-dry timewhen the test paint has been applied to a steel test panel at the appropriate spreading rate and is tested in accordance with as/nzs 1580.401.1, it shall have a surface-dry time not exceeding 1 h for a type 1 product or 2 h for a type 2 product.the standard is downloaded from standard sharing2.6.2 hard-dry timewhen the test paint has been applied to a steel test panel at the appropriate spreading rate and is tested in accordance with as 1580.401.5, it shall have a hard-dry time not exceeding the following periods:(a) type 1 products . 4 h max. (b)type 2 products . 8 h max.2.6.3 recoating propertieswhen a single-coated steel test panel, prepared in accordance with appendix d, is recoated with a further coat (see clause 2.3) of test paint and allowed to dry for 24 h, and then examined in accordance with as/nzs 1580.404.1, there shall be no defects in the underlying test film during or after overcoating and the film shall be of uniform appearance and colour, and shall be free from defects.2.6.4 finishwhen a test panel, prepared in accordance with appendix d, using a single coat of test paint, is assessed in accordance with as 1580.603.1, the coating shall show a smooth and even finish and shall be free of sags, runs, pinholes and craters.2.6.5 resistance to weatheringwhen a test panel, prepared and coated in accordance with appendix d, is continuously exposed at a 45 angle facing nort