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  Dynaplate Bonding Button Electrolysis

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Author Topic:   Dynaplate Bonding Button Electrolysis
Chap posted 05-02-2002 01:30 PM ET (US)   Profile for Chap   Send Email to Chap  
Hello,
Over in the OEM section the Dynaplate Bonding Button was discussed regarding Classic Outrages.
www.continuouswave.com/ubb/Forum6/HTML/000129.html
SSCH brought up a point that was not elaborated on at the time and may impact my boat and possibly others. He related that an "in the water" boat's zincs would deteriorate sooner then normal due to electolysis. This I gather is due to the button remaining under water with the electrical ground current flowing to the zincs? I understand that marinas have their own issues regarding corrosion etc.
www.yachtsurvey.com/corrosion_in_marinas.htm
This all leads me to believe that my "in the water" boat should not have the button and instead should have the ground wire going to the ground mount on the motor?
Thanks for any help or insight regarding this bonding issue.
Chap
jimh posted 05-11-2002 12:30 AM ET (US)     Profile for jimh  Send Email to jimh     
I have tried to look at this issue and make some sense of it, but I don't feel that I can give you authoritative recommendations on it. However, I can observe the following:

The older style of rigging creates a Whaler with two levels of grounding:

#1 Ground: the Dynaplate and the fuel tank systems are bonded together and coupled to the water via the area of the immersed Dynaplate button.

#2 Ground: the battery negative terminal, the engine chasis (and by extension the lower unit), and any electrical equipment with the negative bonded to the chassis are bonded together and coupled to the water via the area of the immersed engine lower units or immersed mounting brackets and their associated zincs.

Since the sacrificial zincs are less noble than the bronze of the dynaplate, they should be subject to galvanic corrosion before the dynaplate material.

In general, because the hull is non-conducting and most Whalers do not make connections to shore power, there are not big issues with bonding of the grounds of 115 VAC electrical systems on board the boat and interconnection to shore power, ground isolation, etc.

On the newer boats, the dynaplate button is omitted and the fuel system is bonded to the battery negative and engine chassis, as far as Iknow.

Chap posted 05-13-2002 09:19 AM ET (US)     Profile for Chap  Send Email to Chap     
Thanks jimh for the reply.
I may be over the top being concerned about my zincs wearing away sooner then normal. What's normal anyway? The idea of two grounds did not occur to me and seems to make perfect sense. I don't think I will worry about it this season and see what happens, unless another issue is brought up.
Thanks
Chap

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