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

 

Advertisement

PaintSquare


Problem Solving Forum

| More

July 30 - August 5, 2012

What is the effect of using a lower-metallic-content zinc-rich epoxy on the life of a paint system?

More items for Coating Materials


Selected Answers

From Derek Righinni of Certified Coating Inspection Ltd on August 30, 2012:
     To my knowledge zinc-rich epoxy is not, as a rule, loaded with zinc to the critical pigment concentration  where the zinc pigments are touching and in electrical contact, and so it is not considered a true sacrificial coating unless the binder is electrically conductive. There may be some confusion here with zinc-rich ethyl silicate paints loaded with zinc to 90% by dry weight, which is truly sacrificial. The zinc pigment in zinc-rich epoxies may be adding to the barrier properties of a coating and may offer some galvanic protection. The question above needs clarifying about quantities: lowering the metallic content from what % to what % and what is the proposed paint system? I hope this helps. (ICorr 3, NACE 3)

From Greg Girard of Valspar - Consumer Group on August 8, 2012:
     Studies have shown that there is a lower zinc content than current levels that can be highly effective while maintaining zinc-to- zinc contact. The accelerated, long-term testing shows equal to improved performance, due to improved flow and the ability to maintain the zinc-to-zinc electrochemical connections. Many real world testing applications have been done and these are showing consistent good performance at two years. Testing continues. Based on accelerated testing, it would appear that a lower zinc level would not necessarily decrease performance.

From Dennis Snijders of APS Dubai on August 3, 2012:
     In atmospheric conditions, your coating will have a shorter expected service life.

From Jay Mitchell of James Hardie Building Products on August 28, 2012:
     Other factors affect the ability of a sacrificial coating to provide substrate protection. For example, permeability, resin matrix and auxiliary pigment conductivity, as well as mechanical properties such as adhesion, flexibility, and sometimes even UV- and free-radical-degradation resistance. The nominal level of zinc required is a function of the coating properties, the environmental exposure and the level of expectation of product performance and longevity. This must be determined empirically for new technologies rather than relying on accepted levels from prior art.

From jonathan arguelles of megapaint and coating corp. on August 1, 2012:
     It will not be effective as cathodic protection compared to high zinc content since corrosion protection depends on its zinc content. The contact between zinc-to-zinc particles and zinc-to-metal substrate plays a vital role for corrosion protection; therefore, the more zinc content, the more "contacts" it would create.

Please sign in to submit your answer this question    

Tagged categories: Zinc


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

Advertisements
 
Jotun Paints Inc.
 
Jotun Jotachar 1709
 
Mesh-free passive fire protection epoxy designed to protect against hydrocarbon pool fire scenarios for up to four hours as defined in the ANSI/UL1709 standard.
 

 
PPG Protective and Marine Coatings Group
 
We Protect and Beautify the World
 
PPG is widely recognized as a world leader in protective and marine coatings, developing innovative, cutting-edge products and services.
 

 
Mitsubishi Gas Chemical America
 
Performance Amine 1,3-BAC
 
A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.
 

 
CS Unitec
 
Remove Coatings, Corrosion & More!
 
For metal & concrete. Scalers, scabblers, deck hammers & scarifiers. Safe for hot work zones. Call our specialists: 800-700-5919.
Demo videos at www.csunitec.com.
 

 
Sherwin-Williams
 
Sherwin-Williams General Polymers Resinous Flooring App
 
Our coatings and linings expertise available 24/7, allowing you to explore the Sherwin-Williams systems best suited for your flooring needs. Android Users Click here to Download the app today!
 

 
BASF
 
New resins from BASF will have metals loving water!
 
Excellent corrosion resistance, low VOC, high gloss, thin films www.basf.us/industrialcoatings dpsolutions@basf.com 800-231-7868
 

 
Carboline Company
 
Carboline is pouring with opportunities
 
We are proud of our exceptional products and services, and believe that people are our greatest asset. Come grow with us!
 

 
Clemco Industries Corp.
 
Maximum Dust Suppression Systems Start at $14,950
 
The system comprises proven technology and equipment with user-friendly flexibility in mind. See it in action.
 

 
Aggreko
 
Dehumidification, Power and Temperature Control Rentals
 
Aggreko offers rental solutions for your painting/coating project. Dehumidifiers, cooling, heating, power and 24/7 service, nationwide.
844-433-9802
 

 
SSPC: The Society for Protective Coatings
 
http://www.sspc.org/
 
Join SSPC and Enhance
Your Career !
 

 
 
 

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

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


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 PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us