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Search took 0.00 seconds. Search: Posts Made By: Snowpetrel
Forum: Construction, Maintenance & Refit 05-12-2015, 13:28
Replies: 10
Views: 1,232
Posted By Snowpetrel
Re: Classic Aluminum hulls

Hi James. One advantage of the older designs, is that they are normally transverse framed rather than longitudinal, so there are often no stringers to trap water and debris and cause local pitting....
Forum: Construction, Maintenance & Refit 05-12-2015, 13:07
Replies: 10
Views: 1,232
Posted By Snowpetrel
Re: Classic Aluminum hulls

This report has some interesting stuff in it. Given its from around 1974 (a good year) that shows that they were developing improved tempers to reduce the exfoliation issues in the marine grades...
Forum: Construction, Maintenance & Refit 04-12-2015, 23:16
Replies: 10
Views: 1,232
Posted By Snowpetrel
Re: Classic Aluminum hulls

Sounds like the flaking might be caused by intergrainular corrosion caused by the rolling process. Also called exfoliation corrosion....
Forum: Construction, Maintenance & Refit 04-12-2015, 21:09
Replies: 10
Views: 1,232
Posted By Snowpetrel
Re: Classic Aluminum hulls

Not really 100% sure of it either, but I've heard of the rolling issues from a few sources, and seen what looks like the results, with an almost grainlike corrosion pattern. I've seen one example on...
Forum: Construction, Maintenance & Refit 04-12-2015, 20:16
Replies: 10
Views: 1,232
Posted By Snowpetrel
Re: Classic Aluminum hulls

In my experience, older alloy hulls can have issues with isolated pin holes and pitting in a few areas that are very hard to detect with ultrasound. Usually areas like under engines, tanks and inside...
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