Requirements for zinc coating treatment of hot dip galvanized products in power fittings

Requirements for zinc coating treatment of hot dip galvanized products in power fittings

1热镀锌溶液

总不纯含量(例外，锡，铝，镍)inzincsolutionusedforhotdipgalvanizingofelectricpowerfittingsshallnotexceed1.50%ofthetotalmass.refertogb/t470fortheimpurities.

2.surfacetreatmentrequirementsbeforegalvanizing

2.1做工表面平整、光滑，没有可编辑的、无缺陷的部位、沥青划痕和其他缺陷影响质量。5.2在铺层前，表面油、rust.weldingslagandoxidelayershallberemoved.the预处理应与温度升高补足，即13912-2.2.2在敷设前，优良行焊接斜面焊，之后按dexxcofgb.t 13912的规定进行前处理完成。"(2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2.2。

三层

3.1 anditisnotallowedtohavethezinclayerexudatedfromtheacidreturningmacular.thepresenceofdarkorlightgrayunevencolorareaswithzinclayerthicknessmeetingtherequirementsshallnotbethereasonforrejectionofproducts.

3.2zincleakagespotswithdiameterlessthan0.5mmareallowedonlocalsurfaces.

3.3对于有联系、接触和保护要求的部分，不允许使用。

3.4集中的锌自由区，convextumorandripplearenotallowedonthesurfaceofplatingparts.thetotalareaofscatteredzincfreezone，保险杠-

A)thegeneralpartsshallnotexceed0.5%ofthetotalareaoftheplatingparts

(B)大零件(Schaspressureequalizing屏蔽，大平面面积在2000厘米以上)shallnotexceed0.1%ofthetotalareaoftheplatingpart；c)thezincleakagespotsonthegalvanizedsurfaceoftheweldareallowed，andthetotalareashallnotexceed3%oftheweldarea.

Theabovezincfreeareashallberepairedbyzincrichpaintorbyweldingwithlowmeltingpointzincalloyelectrode.theuseofzincrichpaintshallcomplywithhg/t3668.

3.5thesurfacedefectsofworkpiecebeforegalvanizing，suchassandholeandslaginclusioncausedbycastingandforgingprocess，shallnotberegardedasthequalitydefectofcoating.

4厚层

后采样，thezincthicknessofthesampleandtheoverallzincthicknessofthesampleshallnotbelowerthanthesmallvaluespecifiedintable2.

Requirements for zinc coating treatment of hot dip galvanized products in power fittings