classical corrosion , galvanic corrosion

the widely-used standards are :

1) NACE
2) SSPC
3) Sa , St

grades as specified by Swedish Institute of Norms Standart :

St 2 means HAND TOOL CLEANING
St 3 means POWER TOOL CLEANING
Sa 1 means BRUSH-OFF BLAST CLEANING
Sa 2 means COMMERCIAL BLAST CLEANING
Sa 2.5 means NEAR-WHITE BLAST CLEANING
Sa 3 means WHITE METAL BLAST CLEANING

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