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AISI 420 stainless steel. Hardened in saltbath.  Salt residue  corroded its surface grain boundary over a humid mid-summer night.


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上: SEM 照片


 

AISI 420 不銹鋼表面晶界腐蝕
箭頭所指為較深的蝕坑. Corrosion pits.

最後2張是橫断面. 500X; 1000X 
Rust (銹) can be seen clearly.
 
 
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