When opening my winch (Enkes 18), I had a bad surprise:
At the alu-stainless joint of the axis (the part in which you stick your winch handle, -part #3 on this drawing-
), the aluminium is badly corroded.
The hole on the picture is the drain that flushes water from inside the axis, which is stupid because it drains the water between the axis and the bronze stand, keeping the water in the joint, thus increasing the corrosion.
My plan is to grind a "gutter" in the stainless part just below the aluminium drain to the bottom of the stainless part, so water will be flushed oustide the winch quickly.
But before doing so, does anyone has a better idea?
I have read the article here on Sailnet about galvanic corrosion and a zinc anode should fix the problem. But where do I place the anode? on the stainless or the aluminium... or both?
In last resort, I will go to a machine shop and have a 100% stainless axis made.
Thank you for your input!