?????????????????? (Hard anodizing) ??????????????? ????????????????????????????????????????????????????????????????????????????????????????????????????? ??????????? +/-15% ???????????????????? ????????????????????????? Hard Coat ??? ??????????????????????????????????????????????????????????????????
การชุบ Zinc Electroplating คืออะไร
?????? Zinc Electroplating ??????? ????????????????????? ?????????? ???????? Cr +3 Trivalent chromium passivation ??????????????????????????? ?????????????????????? ???????????????????????????????? ASTM ??? JIS ?????????????????????????????????? X ray Fluorescence Spectroscopy (XRF ) ?????????????????????