Electrogalvanizing (EGL) Anodes
Zinc plating of steel sheet in a continuous steel processing line. This sheet is used primarily for the automotive and appliance markets. De Nora’s DSA® anodes offer significant advantages over competing soluble and insoluble production systems. Compared to soluble anode systems in zinc sulfate electrolytes, DSA® anodes:
Improve plating uniformity
Reduce energy consumption with smaller anode-to-strip gaps
Improve line operations due to better gap stability
Permit higher plating current densities
Relative to other insoluble anode systems, DSA®anodes offer:
Power cost savings from constant anode-to-strip gap
Insolubility does not require expensive contaminant removal
Better quality product with fewer pollution problems
De Nora offers to EGL customer a portfolio of coating formulations and coating loads to maximise the economics of the operation. TiFace® is a patented anode surface treatment developed by De Nora to repair anodes damaged during operation in an electro-galvanizing high-speed, continuous strip, plating line. The treatment, recovers the integrity of the anode surface thereby allowing the anodes to be recoated. In addition, the TiFace® treatment doubled the surface area of the anodes prolonging the life of the coating. This technology revolutionized the high-speed, strip steel electrogalvanizing industry.
Electrotinning (ETL) Anodes
The use of DSA® anodes for Tin Lines is another important use of the titanium anodes with iridium oxide anode coatings. These anode are typically used for balancing (plating out excess tin) of the dissolved tin in a Methane Sulfonic Acid bath or in a Phenyl Sulfonic Acid bath or for tin plate lines which use DSA® anodes as the main anode for the tin plating.
Balancing Anodes
Soluble anodes, including copper, tin, nickel and zinc tend to operate at less than 100% efficiency. That is, more metal ions enter the electrolyte than would be expected by the Faradaic oxidation of the anode. As the concentration of the metal ion increases, plating quality can diminish and platers are forced to either dummy plate or dilute their plating baths in order to return to an optimal metal ion concentration. In either case, additional costs are incurred due to lost production or supplementary waste treatment.
An extremely cost effective method for controlling metal ion growth is to replace a portion of the soluble anodes with DSA® anodes. Since DSA® anodes operate at higher potentials, it may be advisable to use separate rectification to control the current flow to the anodes. However, platers have successfully used DSA® anodes without separate rectification.
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