A Vintage Mobile Sportsman Trailer

Information about my vintage 1948 Mobile Sportsman trailer.

Saturday, November 06, 2004

Exterior, Streetside

Something I found interesting was the mixed use of stainless steel, and regular steel screws.

Why if they had stainless available, did they also use rust prone regular screws?
I'll probably never know, but all were replaced with stainless!

The rusty round thing high up on the side is the electrical hookup.
The trim strip down the middle once held a bright red insert!


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  • At February 10, 2006 at 12:09 PM, Blogger Jim Larsen said…

    The reason for the mix of screws was that the screw that was securing the aluminum panel in position was cadmium plated to prevent the aluminum panel from corroding.

    It all has to do with the noble metals chart. On that chart you'll find that the aluminum panel was more noble than the cadmium and the cadmium would be sacrificed. When you find a rusting screw it should be replaced with a cadmium plated screw.

    By replacing the screw with a stainless steel screw the stainless is more noble than the aluminum panel and the aluminum will be sacrificed and bi-metal corrosion can occur. The same thing is very important with aircraft.

    They had originally used the stainless steel screw to secure steel.


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