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derekreilly

macrumors newbie
Dec 15, 2013
19
0
Would I need to be careful not to rub the sapphire display with part of the cape cod cloth or would it have no effect on it?
 

teknikal90

macrumors 68040
Jan 28, 2008
3,382
1,943
Vancouver, BC
If you have any expertise in this area, you'd know that anodized aluminum and stainless steel together pose a bi-metallic corrosion risk. However, the risk is totally dependent on the relative amount of each metal and the conditions they're exposed to. For example, small stainless steel screws on aluminum iPhone do not pose a great risk unless you somehow drop it and leave it out on the beach for about a month or so. An example of a safe use of stainless steel and aluminum together is where SS fasteners are used to secure a large aluminum body, and there should be little risk of corrosion even with un-insulated SS fasteners (probably the same as what you've spec'd). On the other hand, small aluminum bolts holding large stainless steel parts together pose a much higher risk. Everything is relative.
The back of the iphone 6 is aluminium with stainless steel apple.
I think we're safe using SS bands on the aluminium watch.
We're talking about a watch here, not an outdoor structure.
 

JayLenochiniMac

macrumors G5
Nov 7, 2007
12,819
2,390
New Sanfrakota
The back of the iphone 6 is aluminium with stainless steel apple.
I think we're safe using SS bands on the aluminium watch.
We're talking about a watch here, not an outdoor structure.

Re-read the post you quoted. The risk is dependent on the relative amount of each metal (e.g., small stainless steel screws with large aluminum body do not pose a great risk whereas the flip side is a much greater risk).
 

JayLenochiniMac

macrumors G5
Nov 7, 2007
12,819
2,390
New Sanfrakota
Why is that so?

See http://aluminumsurface.blogspot.com.ar/2009/04/corrosion-between-anodized-aluminum-and.html?m=1

It has to do with the surface ratio between the two metals, the most favorable case being a very large anodic surface area and a small cathodic surface area. It shows a photo of stainless steel bolts corroding on aluminum body after a 1000 hour salt exposure. That's why we don't normally see SS screws corroding on the aluminum iPhone unless we somehow drop it on a beach and leave it exposed to the salt air for many days.
 
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