【AS澳大利亞標準】AS 3566.2-2002 Self-drilling screws for the building and construction industries Part 2 Corrosion resistance requirements.doc

as 3566.22002licensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).as 3566.2australian standardself-drilling screws for the building and construction industriespart 2:corrosion resistance requirementslicensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).this australian standard was prepared by committee me-029, fasteners. it was approved on behalf of the council of standards australia on 28 february 2002 and published on 19 march 2002.the following interests are represented on committee me-029: australian building codes boardaustralian chamber of commerce and industryaustralian industry groupbureau of steel manufacturers of australia electricity supply association of australia federal chamber of automotive industriesinstitute of materials engineering australasia limitedmetal building products manufacturers associationadditional interests participating in the preparation of this standard: galvanizers association of australiacsiro, building, construction and engineeringkeeping 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 standards may also be withdrawn.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 standards can be found by visiting the standards australia web site at .au and looking up the relevant standard in the on-line catalogue.alternatively, the printed catalogue provides information current at 1 january each year, and the monthly magazine, the australian standard, has a full listing of revisions and amendments published each month.we also welcome suggestions for improvement in our standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. contact us via email at .au, or write to the chief executive, standards australia international ltd, gpo box 5420, sydney, nsw 2001.this standard was issued in draft form for comment as dr 99515.as 3566.22002licensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).australian standardself-drilling screws for the building and construction industriespart 2:corrosion resistance requirementsoriginated as as 35661988.revised and redesignated in part as as 3566.22002.copyright standards australia internationalall 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.published by standards australia international ltdgpo box 5420, sydney, nsw 2001, australiaisbn 0 7337 4386 2licensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).as 3566.220022prefacethis standard was prepared by the standards australia committee me-029, fasteners to supersede(inpart)as 35661988,screws self-drilling forthebuildingand construction industries.the objective of this standard is to provide manufacturers and users with the requirements for the corrosion resistance of self-drilling screws used in the building and construction industries.this standard is part 2 of a two-part series dealing with self-drilling screws for the building and construction industries. part 1 specifies general requirements and the mechanical properties for self-drilling screws.this edition introduces an additional corrosion resistance class intended to meet the requirements for use in coastal areas and specifies a procedure for demonstration of corrosion resistance by exposure at an outdoor test site.the term normative has been used in this standard to define the application of the appendix to which it applies. a normative appendix is an integral part of a standard.3contentsas 3566.22002licensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).page1scope . 42referenced documents . 43definitions . 54classification and designation . 55requirements for corrosion resistance . 66adhesion of metallic coatings . 97porosity of mechanically plated zinc and zinc-tincoatings . 98compatibility . 99marking. 10appendicesapreparation of corrosion resistant self-drilling screwsfor accelerated testing . 12bprocedure for outdoor exposure testing of corrosion resistant self-drilling screws. 14cmethod for determining the porosity of mechanicallyplated zinc and zinc-tin coatings . 18drequirements for outdoor exposure test site . 205as 3566.22002licensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).standards australiaaustralian standardself-drilling screws for the building and construction industriespart 2: corrosion resistance requirements1 scopethis standard specifies the requirements for corrosion resistance of self-drilling screws used in the building and construction industries.2 referenced documentsthe following documents are referred to in this standard: as1397steel sheet and striphot-dripped zinc-coated or aluminium/zinc- coated1791chromate conversion coatingszinc and cadmium2331methods of test for metallic and related coatings2331.1.1method 1.1:local thickness testsmicrographic examination ofcross-sections2331.1.3method 1.3:local thickness testsmagnetic method2331.1.4method 1.4:local thickness testsmagnetic induction and eddycurrent methods2331.3.1method 3.1:corrosion and related property testsneutral saltspray (nss) testhb 18guidelines for third-party certification and accreditationhb 18.22guide 22:information onmanufacturersdeclarationof conformitywith standardsorothertechnical specificationsas/nzs1580paints and related materialsmethods of test1580.408.2method 408.2:adhesionknife test1580.481.1.7method 481.1.7:coatingsexposedtoweatheringdegreeofchecking1580.481.1.8method 481.1.8:coatingsexposedtoweatheringdegreeofcracking1580.481.1.9method 481.1.9:coatingsexposedtoweatheringdegreeofblistering1580.481.1.10method 481.1.10:coatingsexposedtoweatheringdegreeofflaking and peeling1748timberstress-gradedproductrequirementsformechanically stress-graded timber2312guide to the protection of iron and steel against exterior atmospheric .au standards australialicensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).iso8407corrosion of metals and alloysremoval of corrosion products from corrosion test specimens9223corrosion of metals and alloyscorrosivity of atmospheres classification9226corrosion of metals and alloyscorrosivity of atmospheres determination of corrosion rate of standard specimens for the evaluation of corrosivityastmd2247standard practice for testing water resistance of coatings in 100%relative humidityg92standard practice for characterization of atmospheric test sitesg154standard practice for operation flourescent light apparatus for uvexposure of nonmetallic materialsdin50018sulfur dioxide corrosion testing in a saturated atmosphere3 definitionsfor the purpose of this standard, the definitions below apply.3.1 local thicknessthe mean of the coating thickness measurements, of which a specified number is made within a reference area.3.2 minimum local thicknessthe lowest value of the local thickness found on the significant surface of a single article.3.3 reference areathe area within which a specified number of single coating thickness measurements is required to be made.note: for small items the reference area may be the whole of the significant surface.3.4 significant surfacethe part of the article covered or to be covered by the coating and for which the coating is essential for serviceability or appearance, or both and where the coating is required to meet all the specified requirements.3.5 significant surface of screwthe head and undriven shank.4 classification and designationthe corrosion resistance of self-drilling screws shall be classified by the corrosivity of the atmosphere of intended use and designated in accordance with table 1.licensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).table 1classification and designation of corrosion resistancecorrosion resistance classatmosphere of intended use1general use in internal application.2general use in other than external applications but where significant levels of condensation occurs.3external use in mild, moderate industrial or marine environments.corrosivity categories c2 and c3 classified in accordance with iso 9223.4external use in severe marine environment. corrosivity category c4 classified in accordance with iso 9223.note: the specification for self-drilling screws suitable for use in specific corrosive atmospheres are subject to agreement between manufacturer and consumer.5 requirements for corrosion resistance5.1 class 1class 1 corrosion resistant screws shall comply with one of the following requirements:(a)accelerated testing when class 1 corrosion resistant self-drilling screws are prepared in accordance with appendix a and tested in a neutral salt spray in accordance with as 2331.3.1 for 72 h red rust shall not be present over more than5 percent of the significant areas of the screws and there shall be no blistering of the coating.(b)zinc and zinc-tin coated screws the metallic coating of zinc and zinc-tin coated class 1 corrosion resistant screws shall be in accordance with table 2. the local thickness of the metallic coating shall be determined in accordance with as 2331.1.3 or as 2331.1.4 and the minimum local coating thickness shall be determined from three local thickness measurements made on the reference surface shown in figure 1.5.2 class 2class 2 corrosion resistant screws shall comply with one of the following requirements:(a)accelerated testing when class 2 corrosion resistant self-drilling screws are prepared in accordance with appendix a and tested as follows red rust shall not be present over more than 5 percent of the significant surfaces of the screws and there shall be no blistering of the coating:(i)in a neutral salt spray in accordance with as 2331.3.1 for 240 h.(ii)in a condensing atmosphere containing sulfur dioxide at level kfw 2.0s in accordance with din 50018 for 5 cycles.(iii)the assessment of the level of rusting shall be conducted visually so that no doubt can exist that corrosion of the steel substrate is well established.(b)zinc and zinc-tin-coated screwsthe metallic coating of zinc and zinc-tin coated class 2 corrosion resistant screws shall be in accordance with table 2. the local thickness of the metallic coating shall be determined in accordance with as 2331.1.3 or as 2331.1.4 and the minimum local coating thickness shall be determined from three local thickness measurements made on the reference surface shown in figure 1..au standards australiaas 3566.220027licensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).table 2requirements for zinc and tin-zinc coated fastenerscorrosionresistant classminimum porosity rating ofmechanicallyplated coatings(see clause 7)coating typecoating composition(by mass)minimum local metallic coating thicknessmpassivation1electro plated zinc98 percent zinc4as 1791type c2electro plated zinc98 percent zinc12as 1791type c26mechanically plated zinc98 percent zinc17as 1791type c26mechanically plated zinc-tin20-30 percent tin balance zinc12as 1791type c3electro plated zinc98 percent zinc30as 1791type a, b, c or d3hot-dip galvanized98 percent zinc30as 1791type a, b, c or d38mechanically plated zinc98 percent zinc40as 1791type a, b, c or d38mechanically plated zinc-tin2030 percent tin balance zinc25as 1791type a, b, c or d4hot-dip galvanized98 percent zinc50as 1791type a, b, c or d48mechanically plated zinc-tin25-30 percent tin balance zinc45as 1791type a, b, c or d15as 3566.22002licensed to mr exa fast on 18 february 2009. 1 user personal user licence only. storage, distribution or use on network prohibited (10009207).5.3 class 3the exposed portion of the heads of class 3 corrosion resistant screws shall comply with one of the following requirements:(a)accelerated testingclass 3 corrosion resistant self-drilling screws prepared in accordance with appendixa shall comply with the following requirements as appropriate:(i)when tested in a neutral salt spray in accordance with as 2331.3.1 for 1000 h red rust shall not be present over more than 5 percent of the significant areas of the screws and there shall be no blistering of the coating.(ii)when tested in a condensing atmosphere containing sulfur dioxide at level sfw 2.05 in accordance with din 50018 for 15 cycles, red rust shall not be present over more than 5 percent of the significant areas of the screws and there shall be no blistering of the coating.(iii)when non-metallic (organic) coated corrosion resistant self-drilling screws are tested in an atmosphere of 100 percent relative humidity in accordance with astm d2247 for 1000 h there shall be no blister size s3 or larger or a blister density of 1 or greater in accordance with as 1580.481.1.9.(iv)when non-metallic (organic) coated corrosion resistant self-drilling screws are exposed to alternating ultraviolet and water with a test cycle of 4 h ultraviolet radiation of 60c and 4 h condensation at 50c in accordance with astm g154 for 2000 h there shall be no checking, cracking, or flaking and peeling witharatinggreaterthan0inaccordancewithas1580.481.1.7, as 1580.481.1.8 and as 1580.481.1.10, respectively.(b)outdoor exposure testing when class 3 corrosion resistant self-drilling screws are tested at an outdoor test site in accordance with appendix b there shall be no red rust present on the significant surfaces of 95 percent of the fasteners tested i.e., 95 of the100 screws in the test panel.(c)zinc and zinc-tin coated screwsthe metallic coating of zinc and zinc-tin coated class 3 corrosion resistant screws shall be in accordance with table 2. the local thickness of the metallic coating shall be determined in accordance with as 2331.1.3 or as 2331.1.4 and the minimum local coating thickness shall be determined from three local thickness measurements made on the reference surface shown in figure 1.the remaining portions of the screws shall comply with the requirements given in clause 5.2 item (a)(i) or item (b). where compliance with item (b) is claimed, the reference area for the measurement of local thickness of the coating shall be the unthreaded shank.5.4 class 4the exposed portion of the heads of class 4 corrosion resistant screws shall comply with one of the following requirements:(a)outdoor exposure testing when class 4 corrosion resistant self-drilling screws are tested at an outdoor test site in accordance with appendix b there shall be no red