Lead has high corrosion resistance,but in fact the lead anodes that are used are never made of pure lead. Chromic acid in the bath eats away at pure lead,when there is no current. Pure lead is also quite soft, does not hold its shape very well and sags under its own weight. This is why lead is alloyed with other metals in order to give it specific properties. Various amounts of antimony and tin are added to the lead depending upon the application.
One of the most common problem in Long Anodes is current transfer from the bottom of anode.
MS rod insert is generally used in round anodes having length more than 2000 mm and Diameter 50 mm. Its helps in effective transfer of current in the bottom anode and also provides rigidity to the anode.
Shape of anodes is also one determining factor in plating. Anode shape be decided on the type of job to be plated and life of anode desired.
Increase in anode surface area would in anode to cathode ratio , thus improving cathode efficiency. Surface area of anodes are increased using corrugations and waviness.
Life of anodes depends on volume of anode i.e weight of anode.
Anodes are prone to decomposition over time,and/or corrosion with exposure to certain ions or reducing acids in the plating bath. Corrosion starts from the weakest surface areas, like scratches, fissures and pores.
Only Copper hooks are used for connecting anode to bus bar/feeder line coming from rectifier. Copper Hook is TIN plated and perfectly integrated to lead alloy. Tin coating helps in perfect bonding of copper hook with lead alloy.
Copper hook is fabricated to fit on bus bar perfectly. Maximum surface area of copper hook should be in contact with Bus Bar, which helps in reducing heating problem of anode.
Copper hook can be tin coated to improve efficiency of current transfer.
PVC / Plastisol coating is done on the Copper hook to prevent corrosion from various gases and drip leaking of chromic acid from Jigs,Jobs while handling them.
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