TECNOSEAL ANSWERS - MATERIALS 2: GALVANIC SCALE

Home  /  Blog  /  Article

Tecnoseal Answers - Materials Part 2: Galvanic Scale


Let's continue the discussion that began last week on the materials that form the sacrificial anodes by introducing a vital topic to define which metals are best to use in alloys: the galvanic scale.
We have seen that when we install an anode our main objective (even if not the only one) is to protect the metals that make up your boat from the corrosion generated by immersion in water.

This corrosion of metals can not be avoided at all, so if you want to protect them you need to "cover" them with other more active metals. Such active metals become the anodes of the structure under examination and the amount of material sacrificed thereof is committed to protecting the structure itself. Hence the name "sacrificial anodes."
All metals tend to be oxidized. For some, however, this process occurs more easily and for this reason they corrode more than the others. The relative index that determines the corrosion rate can be traced from the galvanic scale.

In the galvanic scale the elements are in increasing order of nobility (from bottom to top). Therefore, at the base we find those with a lower electrochemical potential. These in the cathodic reaction will be those that will corrode becoming anodic area if in continuity with a more noble element.
Furthermore, the metals closest to each other in the galvanic scale will have a lower tendency to create strong galvanic pairs if in contact. It follows that their coupling in the presence of an electrolyte will be much less dangerous than with the use of two metals very distant from each other in the scale.

...continue next week

NEWS & EVENTS

See all news

METSTRADE is the world's largest trade fair for equipment, materials, and systems for recreational....

Our team is ready for the 63rd Genoa International Boat Show from 21 to 26 September.

METSTRADE IS the world’s largest trade exhibition of leisure marine equipment, materials....

For over 30 years Tecnoseal has been present at the Genoa International Boat Show, whose 2022....

Il 2021 ci vede di nuovo presenziare ai principali eventi mondiali dedicati alla nautica e....

NACA family is growing! Tecnoseal is glad to announce that new products have been introduced....

Anche per il 2020 Tecnoseal ha preso parte come espositore al Salone Nautico Internazionale....

Tecnoseal is pleased to announce the arrival of the MY BOAT QR CODE. Born from the union between....

Production of sacrificial anodes in the leisure boat market, fishing, naval, port, industrial, and civil sectors.
Consultancy, Design, and installation of cathodic protection systems.