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JMacLeod
Joined: 26 Jun 2018 Posts: 173 City/Region: Stuart
State or Province: FL
C-Dory Year: 2018
C-Dory Model: 255 Tomcat
Vessel Name: C-Shalom
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Posted: Sat Aug 13, 2022 1:09 pm Post subject: Square-drive stainless screws |
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I noticed the stainless screws used in the window frames are a different composition than the stainless used in the door frames and grab handles.
All were exposed to the same conditions in this spot, but only the window screws show pitting and green corrosion.
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ssobol
Joined: 27 Oct 2012 Posts: 3380 City/Region: SW Michigan
State or Province: MI
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Posted: Sat Aug 13, 2022 2:25 pm Post subject: |
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Seems like you have something other than SS screws in the window frames.
There are different grades of SS (e.g. 304 and 316). 316 is better than 304. Eventually 304 will show some surface rust. Never seen SS turn green. |
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thataway
Joined: 02 Nov 2003 Posts: 20821 City/Region: Pensacola
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Posted: Sat Aug 13, 2022 3:13 pm Post subject: |
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It would be interesting to see if these are ferrous metal. Take a magnet and see if it sticks to the Robertson (name of square drive--comes In 3 different sizes) screw. If green, then suspect some copper plating perhaps under chrome?
Agree with ssobol ref types of SS. However even some SS labeled "316" from China, may not really be 316 alloy., _________________ Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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Robert H. Wilkinson
Joined: 26 Jan 2011 Posts: 1235 City/Region: Port Ryerse
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JMacLeod
Joined: 26 Jun 2018 Posts: 173 City/Region: Stuart
State or Province: FL
C-Dory Year: 2018
C-Dory Model: 255 Tomcat
Vessel Name: C-Shalom
Photos: JMacLeod
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JMacLeod
Joined: 26 Jun 2018 Posts: 173 City/Region: Stuart
State or Province: FL
C-Dory Year: 2018
C-Dory Model: 255 Tomcat
Vessel Name: C-Shalom
Photos: JMacLeod
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Posted: Sun Aug 14, 2022 2:24 pm Post subject: |
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Robert H. Wilkinson wrote: | https://www.trawlerforum.com/forums/s3/stainless-steel-brass-28408.html
This contains some good info.
Rob |
A lot to digest.
Thanks Rob. |
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