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What is the cause of these corrosion spots ?

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Bastian AZ

Bastian AZ

Student
Jan 23, 2023
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Capture_d_%C3%A9cran_2023-01-23_000353_hagjzc.jpg
Capture_d_%C3%A9cran_2023-01-23_000109_yoj3cg.jpg



hello, Our aluminum hatch showed these signs (size of 0.8 po, what is the cause? (this is the internal surface, the external surface was in contact with the cement)
 
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