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Author Topic: De-zink questions ?  (Read 888 times)

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De-zink questions ?
« on: August 16, 2019, 06:25:29 am »
I have been looking at several wilesco steam engines, almost all of which suffer from de-zink near the sight glass...my questions are, can this be stopped, can this be reversed ?, can this be repaired?
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Bruce, St. Paul Indiana, USA
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  Nikola Tesla

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Re: De-zink questions ?
« Reply #1 on: August 16, 2019, 12:24:31 pm »
I have had this discussion before it probally  is not dezinc. But rather leaking via desoldering .
I have had a few wilesco boiler here and repaired because of poor manufacturing design
The sight glass is held in place via  the end plate .
The problem is the piece the endplate bolts to is soldered to the boiler end cap  and the surfaces are not flat to each  other thus instead of 3 or 4 mm join only 1 mm
A easy enough fix .

I can draw a picture to explain later to show what i am talking about .
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Re: De-zink questions ?
« Reply #2 on: August 16, 2019, 01:55:09 pm »
this is what I'm talking about ,should be the fifth picture shows the sight glass
Look at this on eBay http://www.ebay.com/itm/264430930484
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Bruce, St. Paul Indiana, USA
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  Nikola Tesla

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Re: De-zink questions ?
« Reply #3 on: August 16, 2019, 04:41:21 pm »
Ok not a failed joint but I would not class that as dezinc
That appears to be deposits or corrision centered  around the bolts .
Could be a chemical reaction with something not cleaned properly

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Dennis
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Re: De-zink questions ?
« Reply #4 on: August 16, 2019, 05:04:54 pm »
Looks to me like that boiler was filled with some very bad water and left standing with a slow weep for a very long time.

There are many tap water contaminants that can be pretty corrosive/reactive over time. The question in my mind is how much of what we are seeing is just evaporite deposits, and how much is actual corrosion. It is not uncommon for evaporites to take on the colors of the host containers metals, but often in fact very few molecules are involved, so that the actual amount of corrosion is minimal in spite of the colorful appearance. No way of knowing what the story is in this case without taking the plunge and seeing what is what in person I'm thinking!
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Re: De-zink questions ?
« Reply #5 on: August 16, 2019, 08:19:57 pm »
Thanks Dennis & Daniel,
I've wanted one of these for awhile,  but this issue is a rather big problem for me. 😑
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Bruce, St. Paul Indiana, USA
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Re: De-zink questions ?
« Reply #6 on: August 16, 2019, 08:26:05 pm »
Likely the nickeling under the corrosion will be damaged.  Would be a little concerned about the ID of the boiler if, as has been theorized, the boiler was left full of water.
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Scott

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Re: De-zink questions ?
« Reply #7 on: August 16, 2019, 10:31:10 pm »
Quote from: oilfield_steam on August 16, 2019, 08:26:05 pm
Likely the nickeling under the corrosion will be damaged.  Would be a little concerned about the ID of the boiler if, as has been theorized, the boiler was left full of water.
Yes, it pretty prevalent.
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Bruce, St. Paul Indiana, USA
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