Pitting Vs. Uniform Corrosion

[processrj]

What is considered to be Pitting Corrosion and what are the main causes/factors that determine it in CS heat exchanger tubes? In turn, what are the answers to these questions for the case of Uniform or General Corrosion?

Thanks!

 

[mk3223]

Great reference of ASM Material Handbook.

https://www.asminternational.org/search/-/journal_content/56/10192/06494G/PUBLICATION

 

[XL83NL]

It's a matter of terminonology and definitions, and what you consider as 'Uniform or General Corrosion'.
Refer to API RP 571 which provides a soudn basis for this. There, youll see pitting is a form corrosion. General or uniform corrosion (of carbon steel) is mentioned under Cooling Water Corrosion (sect 4.3.4).