Question about trim tab anode material - this does NOT look like Zinc

RangermanRangerman Titusville FLPosts: 77 Greenhorn
I bought a 1996 200 EFI and noticed the trim tab looked like none I have ever seen before.  It has sort of a dark color (see pictures).  It has the part # 31640C5 written on it but googling that didn't tell me what the material is.  The one I am concerned about is the dark one in the pictures.  It has a plastic top visible in the lower picture  The light colored trim tab is off my old engine and I know that one is zinc.  It has no plastic top.

I've heard about aluminum anodes before for certain fresh water applications and this motor came on a bass boat.  But I will use the engine about 50% in salt water.

Does anyone know what material this dark colored trim tab is?

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