PlatingMultilayerCoating/BlackTypeGMW4205
多层涂复/黑色—材料表面处理标准共8页第1页
2004
1Scope范围
Thisspecificationcoversrequirementsforacorrosionresistantblackfinishoveranelectrolytically
depositedzinc-ironalloy,nickelalloyand/orzincnickelalloysubstrate.
本标准为黑色抗腐蚀表面处理要求,包括表面经电解沉积的锌-铁合金,镍合金/底层锌镍合金.
1.1MaterialDescription.Thiscoatingsystemshallbefreeofhexavalentchromateinfinal
productperGMW3059requirements.Theplatingshallbecalledoutonthepartdrawingper
exampleshowninparagraph7.
1.1材料描述.按GMW3059要求,使用该涂复体系的生产出来的成品应无六价铬.按第7段中的例子,零
件必须按照图纸要求进行电镀.
1.2TypicalApplication.Thiscoatingisintendedprimarilyforbulkprocessedsmallsteelparts
suchasbolts,screwsandnutsusedonexteriorandinteriorvisibleparts(cosmeticapplications).
Thiscoatingisespeciallysuitableforinternaldrive(crossrecess,6lobedsocketetc.)threaded
fastenersandselfdrillingandtappingscrews.
1.2特殊运用.本涂层最初使用于大批生产的小型钢件,如螺栓,螺钉,螺母,旨在对零件内外部分起装饰
作用.该涂层尤其适用于内拧入螺纹紧固件(十字槽,6叶凹槽等),及自钻,自攻钉.
1.3Remarks.Useofthiscoatingsystemonthreadedsurfaceand/orbearingsurfaceofjoints
couldaffectthetorque-tensionrelationship.Itisrecommendedthatatorque-tensionstudyofthe
fastenerjointbeperformedbeforereleasingthisfinishonanynewapplication.
1.3备注.若螺纹表面或支撑面连接处使用此种涂复体系会影响扭-拉关系.该表面处理使用于新品试
制前,建议先研究紧固件连接处的扭-拉关系.
2References参考物
Note:Onlythelatestapprovedstandardsareapplicableunlessotherwisespecified.
注释:如无其它规定,只应用最新版本标准.
2.1ExternalStandards/Specifications.表面标准
ASTMD523SAE.USCAR-1
ASTMF1470SAE.USCAR-5
DIN946SAE.USCAR-7
ISO9227SAE.USCAR-11
SAEJ1960VDA621-415
2.2GMStandards/Specifications.GM标准/规范
GM4260PGM9540P
GM4465PGMW3001
GM9071PGMW3059
GM9501P
首次采用日期批准