Forums > Sailing General

For the chemist out there

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Created by lydia > 9 months ago, 12 Dec 2019
lydia
1659 posts
12 Dec 2019 5:38AM
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New transducer bracket on the brides passage putt putt
48 hours in the tide from new
moored on berth in front of house
might need a sign in front of the house saying electroplating works maybe



r13
NSW, 1428 posts
12 Dec 2019 10:06PM
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What is the question here..........if you are asking what the galvanic corrosion issues of different metals are in seawater it is more for metallurgists not chemists as far as I am aware. Good article here;

membership.corrosion.com.au/wp-content/uploads/2017/08/CM-April-2013-Galvanic-Corrosion-Dissimilar-Metals-Technical-Intro.pdf

Am sure you are aware of all this. Another useful article here;

www.industrialgaskets.com.au/flange%20and%20bolt%20insulation/page/shop/browse

We are all aware of the Duralac jointing compound for building masts but there are later alternatives........

www.tefgel.com.au/

southace
SA, 4758 posts
12 Dec 2019 9:46PM
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Yes I don't understand the question? To much red wine?

lydia
1659 posts
13 Dec 2019 3:01AM
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So I have a very poor quality aluminium alloy in the bracket near stainless alloy immersed in salt water
but that alone would not give me the crystallisation in 48 hours unless there was charge in the water
maybe ground leakage from the 240 on the pontoon
just seeing what the brains trust thought

boty
QLD, 685 posts
13 Dec 2019 7:37AM
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im with you Lydia better put an anchor light direct to the fitting

r13
NSW, 1428 posts
13 Dec 2019 3:50PM
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A lot of good articles on line.
www.boatus.com/expert-advice/expert-advice-archive/2019/october/galvanic-isolators-explained yachtsurvey.com/corrosion_in_marinas.htm
Depending on the brand those transom transducers can shoot through single skin glass hulls hence avoid the issue of the transom alum frame and ss fasteners. See plenty of US websites showing the best methods. See here link to shooting through wooden hulls
forum.woodenboat.com/showthread.php?107450-Using-depth-sounder-through-wood-hull

troubadour
NSW, 317 posts
14 Dec 2019 11:08AM
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Apart from the 240v on the pontoon are there any other vessels nearby on shore power?



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"For the chemist out there" started by lydia