電鍍鋅質(zhì)量要求

1、目 錄TOC f t 標(biāo)題 1,1,標(biāo)題 2,2,標(biāo)題 3,31工藝鑒定要求 .8) If aa partt is ttoo laarge tto putt intoo a teest boox, tyypicall struucturees of the ppart ccan bee usedd as ssamplees.Coatingg Embrrittleement1) At lleast threee sampples ffrom eeach pproducction batchh shouuld bee testted.2) Put samplles inn a thhermosst

2、aticc heatting ooven aat 1800200C ffor 0.51 hhour. Take out tthem ffor naaturall coolling. The ccoatinng shoould bbe freee of bubblling oor fallling. Otheerwisee, parrts off thiss prodductioon battch arre inccompliiant.3) Thiss itemm is nnot reequireed forr fasttenerss and zinc base alloyy partts af

3、tter paassivaation.Contentt of HHexavaalent Chromme1) Perfform aa testt everry weeek. Thhe tesst shoould aalso bbe connducteed aftter pllatingg or ppassivve liqquor iis adjjustedd. At leastt one samplle froom thee prodductioon battch shhould be teested.2) Checck passsive filmss for hexavvalentt chro

4、ome acccordiing too the test methood forr hexaavalennt chrrome iin thee ISO 3613.3) If hhexavaalent chromme exiists, quanttitatiive innspecttion sshouldd be cconduccted tto cheeck thhe conntent of heexavallent cchromee usinng collorimeetric methood acccordinng to the GGB/T97791 (tthe innspecttion oorganiizatioon shoould bbe appprovedd by HHuaweii). Thhe conntent of heexavallent cchrom