HOME FAQs BOOKS JOBS: Help Wanted Suggestions you are here: Hotline/Forum => Letter 39017

Sulphuric acids additions via a stainless pipe

++++++

I am currently looking for an alternative to 80% phosphoric acid additions for our process. 10% sulphuric will offer the same characteristic changes to the product but I query the potential corrosion issues that this may cause to stainless steel pipe lines and vessel.
Additions are made at ambient temps.

Can you advise what range of sulphuric acid concentration would be least aggressive to stainless steels.

Brid McMahon
engineer - Cork, Ireland

++++++

I can not give you a finite answer, but a 15% anodizing solution will attack even 316 SS if the temperature goes much above 75F. This is for a constant exposure. Attack increases rapidly on seams and welds as the temperature increases.
Copper, iron and chlorides will also accelerate the attack.

James Watts
- Navarre, Florida

ANSWER or FOLLOW UP POST an unrelated QUESTION HOT Topics

Disclaimer: It is not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information
presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The
internet is largely anonymous; some names may be fictitious and some recommendations may be deliberately harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: