Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site



Armakleen Company, The

Problem Solving Forum

| More

May 29 - June 1, 2012

In preparing for coating, what is the best way to treat a steel surface that has been attacked by microbiologically influenced corrosion (MIC)?

More items for Surface Preparation

Selected Answers

From Harry Peters of CHLOR RID International, Inc. on June 1, 2012:
     A leading source of MIC is the presence of residual sulfates remaining on surfaces prior to coating. Under coatings and in low dissolved oxygen environments, the sulfates can be reduced by the bacteria from sulfates to sulfides in the presence of hydrogen and aided by the presence of a metal surface. In this condition the mere presence of bacterial deposits can promote aggressive pitting corrosion. Test for and remove residual sulfates. Our experience is that sulfates adsorbed to the metal surface are difficult to remove, and dry abrasive blasting is in no way sufficient to accomplish this task.

From Timothy Coleman of Poxycor on May 29, 2012:
     Depending upon weather, the surface profile, and the type of coating being applied, I would first dry abrasive blast with a good, clean, hard abrasive. I would then UHP the surface to clean any contaminants left by the abrasive and or/ the MIC, thoroughly dry the surface, and check the PH of the surface as well as for chlorides.

From Jeremi Day of Allphaz Inspection Services on May 30, 2012:
Deployment of Dynamic Bio-static Coatings

From Otto Drozd of J. Mori Painting, Inc on May 29, 2012:
     Microbiologically-influenced corrosion is brought about by the presence of microorganisms in biofilms on the surface of the corroding material. A biofilm is an assemblage of surface-associated microbial cells that is enclosed in an extracellular polymeric substance, a matrix of microbial cells that is not removed by gentle rinsing. They are not only very tenacious but also highly resistant to disinfectants such as chlorine. Depending on the amount of MIC present on the surface ( 33% or less), the problem can be treated by high pressure water jetting (SSPC-SP12/ NACE No 5).  Above 33 % the surface should be prepared by Commercial Blasting (SSPC-SP6/ Nace No 3). Unfortunately, there are no standards present today that regulate the treating of MIC-affected surfaces.

From Loren Hatle of CorrLine International, LLC on May 29, 2012:
     Because of the covalent bonds created between the non-water- soluble metabolic by-products produced by microbial activity and the possible availability of water-soluble contaminants, i.e., chlorides, the success of a coating life will be compromised without removing the MIC by-products. There is a solution.

Please sign in to submit your answer this question    

Tagged categories: Corrosion; Steel

Current PSF Question | Submit a PSF Question | Full PSF Archive

Graco Inc.
Graco EcoQuip 2: Experience the Difference
While others claim their equipment is the same, none of them compare to Graco’s EcoQuip 2™ Vapor Abrasive® blasting line. Visit to learn more.

CHLOR*RID International Inc.
Companies that invest in corrosion control use CHLOR RID products
  • Soluble salt removal liquid
  • Test kits to verify contamination levels
  • Surface passivation to hold the blast
INFO@CHLOR-RID.COM 800.422.3217

SABRE Autonomous Solutions
Removing blasting operators from harmful environments is our key objective.

Tarps manufacturing, Inc.
QUALITY MADE IN AMERICA —Available near you!
CLICK to get a behind-the-scenes look at how Tarps Manufacturing makes the highest-quality tarps right here in the USA — available nationwide.

NLB Corporation
NLB Sure Shroud: Greater Protection and Flexibility
NLB’s Sure Shroud’s lighter weight and flexibility reduces operator fatigue and offers unmatched protection against high pressure hose ruptures. 10k to 40k psi rated.

Carboline Company
New product: Carbozinc® 608 HB
Introducing a new high build zinc-rich primer that can save you time and money by eliminating the epoxy intermediate coat!

SAFE Systems, Inc.
Enduroguard -
The Tough Cable
for a Tough Industry.
Reduce maintenance costs and down time, increase job site safety with Enduroguard Cable. Available exclusively from SAFE Systems. UL listed, flexible, abrasion resistant and cut resistant.

SSPC: The Society for Protective Coatings
Join SSPC and Enhance
Your Career !

Modern Safety Techniques
Modern Safety Techniques
With our unique LTCat, we can help to provide clean, safe breathing air to your workers. Take a look at our Breathing Air Systems, we supply at least twice as much charcoal as our competitors! Modern

US Minerals
Hit Harder. Clean Faster.
Black Diamond abrasive products are the toughest, most effective blasting media and supply the superior power you need to get any job done.


Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL

The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us