What Does Galvanic Series Mean?
The galvanic series is a chart showing the relationships and a guide for selecting metals that can be joined, with an aim of helping in the decision-making process. This is done by illustrating which materials have a minimal tendency to a galvanic interaction, or the need or even degree of protection that can be applied to reduce the expected probable interactions.
In general, the further apart materials are in the sequence, the higher the level in the galvanic series, and hence the higher the galvanic corrosion risk.
The galvanic series serves as a simple qualitative guide only, and does not give any information on the galvanic corrosion rate.
The galvanic series is also known as the electro-potential series.
Corrosionpedia Explains Galvanic Series
The galvanic series defines the nobility of metals as well as semi-metals. This process happens when two metals are submerged in an electrolyte or when electronically connected, before letting the base experience galvanic corrosion. The corrosion rate will be influenced by the electrolyte as well as the difference in nobility. This difference is then measured in terms of voltage potential. Batteries form the basic principle of metal corrosion potential in the galvanic reaction.
This list is mainly sorted by corrosion potentials. Many confuse it with the electromotive force (emf) series, which is not always the case. Each alloy or metal has a distinctive corrosion potential. The more negative a metal or alloy is in the galvanic series, the more likely it is to suffer galvanic corrosion, while the positive shows resistivity to corrosion when subjected to viable conditions for corrosion. The closer a metal or an alloy is in the series, the less are the effects of galvanic corrosion compared to those metals far apart in the series with greater corrosion.
Alternatively, the series can be determined by the anode and cathode reactivity to the metals' electrons. Those metals with high numbers of electron reactions in the anode are located lower in the galvanic series compared to those with higher reactions, with the opposite true in the cathode.