Anodizing is an interesting field and it is an electrolytic passivation process to increase the thickness of the natural oxide layer. When aluminum is exposed to air it will form a natural oxide layer.  It is the anodized oxide layer that can be colored with different dies after the anode cathode electrolytic passivation. This is my own understanding of the process used so let me know if I am wrong.

Anodizing increase corrosion resistance and wear resistance. Victorinox has used handles of aluminum for over 40 year and to increase the quality of the handles they are anodized.

Also the dividing layers of a SAK may be anodized depending on the application and functionality. Not all dividing layers are anodized.

Some Swiss Army Knives has been exposed to elements and substances that have caused damage to the surface on the aluminum dividing layers.  If a SAK get maintenance it will last for a very long time without any damages.

On the picture you can see a side plate and a dividing layer made of aluminum from a rather hard used Victorinox 91mm knife. All the discoloration you can see on the surface is caused by scratching. This from sand or other materials that’s been in the mechanism. Some discoloration will probably always happen. The surface got no buildup of corrosion or other malformations and it is this that is important.

Victorinox changed to aluminum dividing layers in 1951 this because of weight and excellent process ability.

Galvanic corrosion or this is the term collectors and users use on the buildup of the surface on the dividing layers or side plates. This buildup is not good because it will affect the functionality of the SAK. The functions will not be possible to open depending on the extent of damage or buildup.

If a SAK that is used get some maintenance and oil it will not happen.

On the above picture you can see the sideplate of aluminum from the same knife thats seen rather hard use for many years.This sideplate is from the layer that hold the blades. The mainblade is the most used function and there is no negative to find at all. No buildup on the surface only some scratches and some discoloration. This knife has seen saltwater and salty air + soaps and more.

update anodizing and color


From 1957 Victorinox has used aluminum handles on the 93mm category. From my understanding these are anodized and then colored. I have never seen any wrong on the surface on this category. Usually the dividers are made of brass or nickel-silver.

Update hard anodizing

Some special applications may be hard anodized and it is my understanding that the thickness of the layer can be increased further.

There is different information to be found on the internet and I understand hard anodizing to increase the wear resistance of the surface or color. A thick anodized surface is porous and therefor one needs a sealing process. It was interesting to see on youtube that after coloring one need to boil and in this process one may use a special sealing compound.

These are only my own research and how this Victorinox knife is hard anodized I do not know, there is some information on the internet on black anodizing processes or the types.

update aluminum oxide layer


It is my understanding that aluminum form a natural oxide layer and like we know it can with the help of anodizing further improve this ability. If one scratch the surface of an anodized part it will get a slightly different or matt aluminium surface again and become vulnerable.

When color anodizing under current one may color the aluminium oxidized layer.

update anodizing


Another interesting part is the use of the anodizing to stop further oxidation/changes and when this is scratched by sand or other dirt it may become vulnerable.

Update the knife and its history

In the 100 year book the knife and its history there is a short but good information on the two anodizing plants. This was in 1984 and it is mentioned about the dividers and scales that are anodized. Aluminum scales are anodized before being printed and coloured and then dipped in a sealing bath to plug the pores.

Update Alox

The silver Alox gives much value for the money.

25.03.2021 130mm Hunter Pro Alox Tiger Orange 2021

This is my latest Victorinox Alox knife with anodizing. First I can share some info on this limited 2021 Hunter Pro knife. It got a perfect blade centering with a fully tight locking. It is a beautiful quality blade in deed. The tiger orange color is very beautiful. The scales are anodized and Victorinox call it Eloxal anodic oxidation process. I can also mention that there is some conflicting information regarding the M model with one hand opening, if we will see some colors on this or if they will just use the plain blade. The tiger orange is a limited color for the Hunter Pro, Pioneer X and Classic Alox for 2021.


Information about alox:

There is no doubt that they are some of the most durable Victorinox SAKs. I know this very well because I have seen a good amount of knives over the years. Some with a lot of scratches, dings and practically no color left that still got full functionality. Many of them are known for the sturdy construction. The Hunter Pro Alox is s a robust lock back folding knife that fit very well with this family. Under the aluminum/alox handles there are stainless steel liners which sums up to a very strong handle. The inside of them are rounded and this is a very nice detail for the comfortable grip without gloves. This is a folder with Swiss precision. 

26.03.2021 every year

The information on the 2021 card is in general about the product and anodizing. It is mentioned that the oxide layer is hard which I intrepid as hard anodizing process because there are levels on this too as you know. The surface is very even under the light. The Hunter Pro Alox is going to be part of the three knives every year from 2021.

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27.07 | 19:11

Thank you, Greetings from Norway! This is very interesting I did not know this. Thanks! Best Regards

27.07 | 18:35

Greetings from Hungary! Did you know that the head curve "inspired" the Spyderco Hungarian folder?
Exactly by a Hungarian designer who works for Spyderco (I can't remember his name)

26.07 | 19:31

Hi, thank you very much. I am very glad to hear the infirmation is helpful. Best Regards Trond

26.07 | 16:51

Thanks for this unvaluable information. I´ll translate to spanish for other victorinox fans.

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