What type of Corrosion 1

[nabeel3]

Greetings
What type of corrosion is this? Pitting or General corrosion or
Carbon steel Deminilarised Insulated Water Tank. This is found after removing insulation. tank
Tank is near to sea .

 

[0707]

IMO Luisiana touches the point and explain it well

 

[mrfailure]

Have you eliminated the possibility of microbiologically-induced corrosion? This seems a localized area that was attacked that would not make me think of general pitting corrosion.