GB/T 28485-2012 镀层饰品 镍释放量的测定 磨损和腐蚀模拟法

ICS39.060

Y88

NATIONALSTANDARD

OFTHEPEOPLE'SREPUBLICOFCHINA

中华人民共和国国家标准

GB/T28485-2012

Coatedadornment-Detectionofnickelrelease-

Methodforsimulationofwearandcorrosion

镀层饰品镍释放量的测定磨损和腐蚀模拟法

IssuedonJune29,2012ImplementedonNovember1,2012

JointlyissuedbytheGeneralAdministrationofQualitySupervision,Inspectionand

Quarantine(AQSIQ)andtheStandardizationAdministration(SAC)

ofthePeople'sRepublicofChina

GB/T28485-2012

Foreword

ThisstandardisdraftedaccordingtotherulesofGB/T1.1-2009.

ThisstandardismodifiedfromEN12472:2005+A1:2009<Methodforthesimulationof

wearandcorrosionforthedetectionofnickelreleasefromcoateditems>(English

version).

TheconstructionofthisstandardismadesomeadjustmentcomparingwithEN

12472:2005+A1:2009.Thecomparisonlistaboutthechaptersandclausesbetweenthis

standardandEN12472:2005+A1:2009isgiveninannexA.

TherearesometechnicaldifferencesbetweenthisstandardandEN12472:2005+A1:2009.

Theclausesrelatedwiththosedifferenceshavebeenmarkedthroughtheverticalsingle

lineonthemargin.ThetechnicaldifferencesarealsogiveninannexB.

Pleasenotethatsomecontentinthisstandardmayrelatestothepatents.Theissue

organizationwillnottaketheresponsibilityforidentifyingthepatents.

ThisstandardwasproposedbyChinaNationalLightIndustryCouncil.

Thisstandardisunderthejurisdictionofstandardizationtechnicalcommitteeof

jewelry(SAC/TC256)

Draftingorganizationofthisstandard:Nationaljewelryqualitysupervisionand

inspectioncenter,GuangdongInspectionandQuarantineTechnologyCenter,Shandong

InspectionandQuarantineTechnologyCenter,BeijingJewelryqualitysupervisionand

inspectionstation.

Chiefdraftingstaffofthisstandard:LiZiqing,LiYupeng,HuangLina,LiuChonghua,

XingLi,GaoXuhui,LiWujun.

GB/T28485-2012

Coatedadornment-Detectionofnickelrelease-Methodforsimulation

ofwearandcorrosion

1.Scope

ThisStandardspecifiesamethodforacceleratedwearandcorrosion,tobeusedpriorto

thedetectionofnickelreleasefromnon-nickel-coateditemsthatcomeintodirectand

prolongedcontactwiththeskin.

2.NormativeReference

Thefollowingdocumentsarenecessarywhenthistextisapplied.Fordatedreference,

onlythedatededitionappliestothisstandard.Forundatedreferences,thelatesteditionof

thenormativedocument(includingalltheamendments)isapplicabletothisstandard.

GB/T19719Jewelry-Determinationofthereleaseofnickel-Methodofspectrometry

3.MethodandPrinciple

Theitemstobetestedareexposedtoacorrosiveatmospherebeforebeingplacedintoa

tumblingbarreltogetherwithawearmediumofabrasivepasteandgranules.Thebarrelis

rotatedsoastosubjectthetestpiecestowearfromthewearmedium.Theitemsarethen

testedfornickelreleaseinaccordancewithGB/T19719.

4Reagentsandmaterials

Exceptwhereindicated,allreagentsandmaterialsthatcancomeintocontactwith

samplesorreagentsshallbedemonstrablyfreeofnickel,andallreagentsshallbeof

recognizedanalyticalgradeorbetter.

4.1Corrosion

4.1.1Container

Containerwithalidandadeviceforsuspendingthetestpieces,allpartsmadeofinert

material(e.g.glassorplastic).

4.1.2Corrosivemedium

Dissolve50gDL-lacticacid,>85%purity,and100gsodiumchloridein1000ml

de-ionizedwater.

4.1.3Degreasingsolution

Anappropriatelydiluted,neutral,commerciallyavailabledetergentshallbeused,for

example,a0,5%aqueoussolutionofsodiumdodecylbenzenesulfonate.

4.1.4De-ionizedwater

De-ionizedwater,specificconductivitymaximum1μS/cm.

4.1.5Laboratoryoven

Laboratoryoven,capableofmaintainingatemperatureof(50±2)°C.

4.2Wear

4.2.1Tumblingbarrelandretainingassembly

Thetumblingbarrelandretainingassemblyshallbeinaccordancewiththefollowing

description:

-barrelofhexagonalcross-sectionandinternaldiameterof19cmperpendiculardistance

betweenoppositesidesdesignedtorotatearounditsaxiswhichisorientatedhorizontally

(seeFigure1);

-retainingassembly,suitableforattachingthetestitemssothattheydonotcomeinto

contactwitheachotherduringtumbling;

-retainingassembly,withitemsattached,shallbeinsertedintothebarrelfortumbling.

Dimensionsinmillimetres

Key

llengthofbarrelaxis,asrequired

aaxisofrotation

Figure1—Viewoftumblingbarrel

4.2.2Weartestapparatus

Adevicecapableofimpartingtothebarrel(4.2.1)aconstant(30±2)rotationsperminute.

Thedeviceshallbecapableofallowingthedirectionofrotationtobereversed.

4.2.3Abrasivepaste

Abrasivepasteproducedfordry-tumblingbarrels.Theabrasivepasteshallcomprise:

-6%to8%Esterwaxofmontanicacids-WaxE[CASNo.73138-45-1];

-3%Octadecanoicacid(stearicacid)[CASNo.57-11-4];

-30%to35%Petroleumdistillates,hydrotreatedlightparaffinic[CASNo.

64742-55-8];

-2%Polyeth