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

 

Download our free ebook on Abrasive Blast Cleaning

Paint and Coatings Industry News

Main News Page


Deflecting the Assault by Salt

Tuesday, May 27, 2014

More items for Surface Preparation

Comment | More

An often-invisible enemy of coating performance—soluble salt and chemical contamination—is the focus of the newest PaintSquare Video Learning Center how-to.

"Cleanliness of a Surface—Soluble Salts" is one of 19 videos in the original instructional series, which explores multiple aspects of protective coatings work.

Images: KTA-Tator Inc.

"Cleanliness of a Surface—Soluble Salts," now in the PaintSquare Video Learning Center, discusses testing for surface contamination before painting.

Created and narrated by experts at KTA-Tator Inc., the video series covers a wide range of topics, from quality-control and health and safety issues, to basics on the proper use of coatings instruments.

Removing Contaminants

In this video (4:08), KTA's William Corbett discusses how surface cleanliness is affected by soluble salts and chemical contamination, which is often invisible.

The cleanliness of a surface before coatings application is "one of the most critical factors in determining the long-term performance of a coating system," Corbett says.

Failure to remove contaminants from steel can cause or accelerate corrosion, and chloride contamination is usually most detrimental, according to Corbett.

Project specifications commonly require testing before coating application, and testing methods can be found in:

  • Four sections of ISO 8502 (Part 5, Part 6, Part 9, and Part 10), which describe various methods of surface extraction and analysis, both ion-specific and conductometric; and
     
  • SSPC Guide 15, "Field Methods for Extraction and Analysis of Soluble Salts on Steel and Other Nonporous Substrates," which describes at least a dozen methods of field retrieval and analysis of soluble salts that can be performed in the field, such as patch cell retrieval, swabbing, filter paper extraction, soluble salt meters, and testing strips.

Working with Project Specs

However, neither the ISO or SSPC guides address tolerable levels of surface contamination by soluble salts, Corbett notes. Until industry standards are developed, project specifications must indicate the maximum quantity of soluble salts that can remain on a surface and be safely coated over.

PaintSquare Learning Center

Failure to remove contaminants from steel can cause or accelerate corrosion, and chloride contamination is usually most detrimental, according to Corbett.

"For example, the specification for a tank located in a mild, rural environment may allow a relatively low surface concentration of soluble salt for the interior, and not even address restrictions at all for the exterior," Corbett explains.

The Navy has developed immersion and atmospheric conductivity thresholds, and NACE Technical Committee Report 6G186, "Surface Preparation of Soluble Salt Contaminated Steel Substrates Prior to Coating," provides information for using coatings in service environments where soluble salt contamination of the substrate is suspected.

Future Topics

PaintSquare expects to present a new Learning Center video from the series every two weeks. Future topics in the series include:

  • Adhesion;
  • Concrete Prep and Painting;
  • Film Thickness issues;
  • Holiday Detection;
  • Moisture Testing; and
  • Steel Surfaces.

The full series will be available free in the PaintSquare Video Learning Center.

   

Tagged categories: Chlorides; Education; ISO; KTA-Tator; PaintSquare; Salt contaminant levels; SSPC; Surface preparation; Video

Comment Join the Conversation:

Sign in to our community to add your comments.

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


Montipower, Inc.
The MBX Bristle Blaster

Get a 2.7 to 3.3 mil profile and a Near White Metal Clean. For info visit www.mbxit.com or call 877 629-8777


NLB Corporation
Rotating water jets increase coverage

NLB lance has rotating water jets (40,000 psi), widening the spray pattern to cover more area. Features air-driven swivel with dual triggers to enhance safety.


CHLOR*RID International Inc.
Free Webinar

Learn about soluble salts, along with a discussion on allowable levels.
More information at
www.chlor-rid.com,

800-422-3217


Minerals Research & Recovery

HIGH PERFORMANCE ABRASIVES


“Made in the USA!”

Why recycle waste from other countries? Go FASTER, CLEANER, at 1/3 THE COST with MR&R “All-American” Sharpshot®HP!!

WATCH THE VIDEO


Axxiom Manufacturing
The Undisputed
Industry Leader.

Proven Innovation. Job Performance. Industry Training. Workplace Safety. Only Schmidt® abrasive blast equipment by Axxiom Manufacturing delivers it all!


Hempel (USA) Inc.
HEMPEL PROTECTIVE COATINGS

Efficient systems and high quality products to reduce your maintenance costs. Visit Hempel Protective for more information.


Clemco Industries Corp.
Powerful Protection in a Small Package

Mounts inside blast helmet, alerts operator to dangerous breathing-air condition by audible, visual, and vibratory alarms. Easily calibrated, battery operated.


Sherwin-Williams
Sherwin-Williams Protective & Marine Coatings

With 4,000 distribution points and 3,700+ years of experience, Sherwin-Williams delivers the products, support and expertise you need, right where you need it.


Novatek Corporation
Dustless Coatings Removal

Strip it, clean it, and profile it,
all dust free! High production
rates and Blast like finishes.
Comply with new lead
standards.

 
 
 
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 2000-2015, 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