effect of chloride on carbon steel

[kissjxp]

Normaly, 304SS and 316SS are not used in high concentraion of Chloride condition in order to avoid pitting and crevice corrosion. How about carbon steel, do we need to consider chloride effect?

 

[CoryPad]

Yes

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[EdStainless]

In CS the higher Cl will lead to higher conductivity which will result in accelerated general corrosion. You can get severe localized corrosion also.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[moltenmetal]

Cl- definitely can cause pitting in carbon steel. Jones, "Principles and Prevention of Corrosion" has a nice schematic of the pitting mechanism in iron. But SCC is not also a worry: Jones says "...hot aqueous chloride solutions readily crack stainless steels but do not have the same effect on carbon steels, aluminum or other nonferrous alloys."

 

[strider6]

Chlorides increase the conductivity of the fluid and increase the catohidc areas in the corrosion cell. The consequence is an higher general corrosion and possibility of localized corrosion (not pitting) due to the destruction of passive films.

S.

http://www.corrosionist.com