The use of coatings
One very successful Victorinox knife is the SwissTool and this is a very strong tool with top corrosion resistance. The SwissTools
are very durable. The use of black oxide coating on them can give an extra protection against corrosion but usually never needed.
I have noticed on many new knives that the use of different
coatings on the functions from the factories are relative popular by many collectors. Both Wenger and Victorinox use this. This coating can increase the corrosion resistance on the tools itself or change the appearance of the SAK. I do not know if this can
have a positive effect for the relations of the steel towards the aluminum liner?
For me the only conclusion is that the best would be an extra protection for the aluminum when it comes to the issues
mentioned in my articles on the Officers type knives. Today there are different levels of anodizing for aluminum but this would be more costly.
The construction of a SAK need some oil on the friction parts mentioned in the manual. The best is to use food grade oil or a mineral oil type.
The best functionality on a SAK is when it is clean and oiled. During hard use then there may become some friction towards the aluminum liners from the springs or functions. There is flexibility in the construction and it is not rare that it may flex
slightly during a twisting motion when using the screwdrivers for example. Without oil then the functions and springs may rub on the liners and cause some wear on the surface on the liners. The best is some oil on the friction parts mentioned in the manual.
Just some is needed and this will also cover the outer parts of the springs as well and protect.
is flexibility in the construction and the Swiss Army Knife is always in the elastic region.The spring and the quality of it is important.
When opening and closing all the functions for many years
can cause some wear on the liners depending on how well and good the precision and assembly of the riveting is. Oil on the friction parts will not only protect the surface between the tang and the spring it will also protect against wear on the liners.
Durability of the SAK
The Officers knives are
riveted with brass pins. The use of bushing serves two purposes.
When using the SAK with relative hard hand will or may cause it to flex but this is no problem because the flexibility is there. The
hard twisting motion when using the screwdrivers may cause the edges of the hole in the functions to wear against the pins. Sand or dirt in combination with twisting or just opening and closing the functions may cause wear in the form of a groove in the pins.
This is usually never a problem.
If the construction is bend and by this I mean used so much force that it goes passed the flexibility then this may cause problems for the functionality.
The best surface on the aluminum is the glass like anodized
surface on them. This will prevent the wear or friction further. The original surface from the factory is fine but it could be better.
The pressure from the springs on the tang and backside of the
blade on the functions is important for not only holding the functions in place but also function as the support for the blade when using force against the edge. The spring will function as a guide unit as well. The riveting is important on the SAK so the
correct functionality and moving of the functions can be done. To hard and it will be difficult to open and close and to little will cause play in the functions.
Some of the knives that are most affected by the disruption or buildup on the aluminum surface are the most modern knives within 20 years. This is usually always on neglected or hard used knives but never on
an unused knife. What is most surprising is when this happens between the liner and plastic handle.
On this picture
you can see one of the worst examples of disruption on the aluminum liner. This is supposable from a used knife. The buildup has mixed with substances and became impossible to use. Opening or closing was almost impossible. To open and close the blade or functions
many times only results in bending or forcing the riveting out.
This is absolutely not a problem most people should worry about and with the maintenance no problem at all.
Usually on damaged knives the disruption and change on the aluminum is only in a spot formation or a small river like disruption outwards.
PS When bending or pressing the rivet
bushing outwards the knife will function but without good functionality. It will not break apart. I took it apart on purpose to see.