... technology. Using external power to anode polarization is the frequently-used method to protect anode. ... Shandong, Hebei , Sichuan, Henan ,Hunan ,Guangdong and other provinces, most of products export to Brazil, USA, ... 15-20working days.4.What is your terms of delivery?We accept FOB, CFR, CIF, EXW, etc. ... You can choose the most convenient way for you. Besides that, we ...