ANODE OF THE WEEK 53

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ANODE OF THE WEEK 53


Weld-On Anode with Aluminum Strap

Before moving on to another category of sacrificial anodes, we stop to see in detail a very special type of weld-on anode, the brainchild of Tecnoseal and of the suggestions from its customers. In today's Anode of the Week we will talk about the weld-on anode with aluminum strap.

Before starting, however, I remind you that if you look for a list of all the articles released up to now, you can find it in this convenient index.

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Of this particular type of anode, we had actually already spoken in the Anode of Week 02, that is the second article of this series ever released. An article that, despite contains information that is still valid, definitely needs a small update to be qualitatively up to the rest. Not to mention that some things can be added and specified.

The wold-on anode with aluminum strap obviously has the same basic characteristics as the normal weld-on anodes with strap, which we talked about in the Anode of the Week 48, but it is made SPECIALLY for aluminum hulls. Its peculiarity is precisely the presence, inside, of an aluminum strap instead of an iron or steel one. This detail was suggested to Tecnoseal, for the first time , by some customers belonging to the US market, a market that boasts a large presence of aluminum hulls, although it was, later, sold all over the world.

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But why was this change requested? The answer is all in the different melting point which have iron and steel compared to aluminum. By melting point we mean that certain temperature at which the melting process takes place. In practice, to weld two metals, it is necessary that these found and mix together, so as to be like a single metal once the welding area has cooled, to avoid any kind of detachment.

Now, the melting point of the aluminum is 660.3 °C while that of the iron is 1538 °C. More than double! The steel, being itself an alloy, does not have a precise melting point, but this oscillates, however, between 1370 and 1536 °C, that is well above the double of that of aluminum. This difference made the installation of normal weld-on anodes with strap on aluminum hulls a real hell. Possible, but also very difficult. A problem that is FULLY RESOLVED using, instead, an aluminum strap.

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Weld-on anodes with aluminum strap by Tecnoseal are available in all three alloys (aluminum, zinc and magnesium). Here a further clarification is needed. In case you choose to use the anode in aluminum alloy, you must absolutely avoid direct contact with the aluminum hull (maybe of the reason why you should make this choice we'll talk better in a future Tecnoseal Answers). To do this, place either a rubber pad or a layer of paint between the back of the anode and the hull itself.

A small side note. On the Tecnoseal anodes of this type is present the wording USA, almost to pay homage to the origin of the first customers that have pushed the company to conceive this solution.

For more specific details you can refer to page 93 of our catalog.


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