PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

Download our free e-book! Corrosion Under Insulation. Sponsored by Thermion.

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

Atlantic Design, Inc.
CLICK TO SEE...

what we did to this machine! Let ADI upgrade your machine, extending the life, efficiency, and value. Any make. Like new, but better! 866.Call.ADI


Axxiom Manufacturing
Schmidt Improves Conversion Kits

Schmidt's conversion kits turn out-of-date blast pots into high quality, efficient blasters. Quick, easy to install with step by step instructions.
Call 1-800-231-2085


Harsco
Find BLACK BEAUTY® Abrasives

Use our online tool to search by address, city or zip code to find where you can buy BLACK BEAUTY® abrasives. Or call us toll free: 1-888-733-3646


Advanced Recycling Systems
ADVANCED RECYCLING SYSTEMS (ARS)

Recycling Machines, Dust Collectors, Rapid Deployment units are time-tested and approved for the rugged industrial environment. Contact ARS today!
(330)536-8210


Monti Tools, Inc.
BRISTLE BLASTER® - THE ORIGINAL ONE

Surface cleanliness of SSPC-10 | Anchor profile
up to 4.7 mils | Removes corrosion & coatings |
ATEX approved for zone 1
| www.monti.com | 832-623-7970


Termarust Technologies
Termarust (HR CSA) Chemically Stops
Active Corrosion

Truss bridge treated in 2000 with Termarust's (HR CSA) field-proven rust mitigation system chemically stopped corrosion, crevice corrosion & pack rust.


CHLOR*RID International Inc.
Hold*Blast

*Provides outstanding
  performance
*Easy to use and only pennies
  per square foot
*Works with poor quality
  water
*Use for mist blasting, vapor
  blasting, wet blasting and
  UHP WJ
*Leaves no residue and
  provides excellent adhesion.
  www.chlor-rid.com


NACE International, The Corrosion Society
Power On

Extend the life of your generation, transmission, and distribution systems by learning how to integrate corrosion control into your asset management plan.


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.


WINOA Group
W Abrasives - Surf Prep Pack

Experts in surface preparation are not working only on greens. To discover the SURF PREP PACK dedicated to experts. Visit our website, www.wabrasives.com.

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design 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 PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us
 

© Copyright 2000-2016, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com