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

 

Download our free e-book! Quality Control

Paint and Coatings Industry News

Main News Page


Newest Corrosion Weapon: Poison

Tuesday, August 27, 2013

More items for Quality Control

Comment | More

For those who find blasting and coating too much work to fight corrosion, Australian materials engineers are reporting a new option: arsenic.

In a discovery that could have major implications for multiple transportation and electronics industries, scientists at Monash University have found that adding arsenic to the lightweight metal magnesium dramatically reduces the metal's corrosion rate.

The arsenic acts as a cathodic "poison" that retards the corrosion reaction, says the team, led by Nick Birbilis, an associate professor of materials engineering.

Corroded magnesium alloy
David von Behr / Pixelio

Magnesium alloys are ultra light weight and strong, but vulnerable to rapid corrosion.

The team is working with Australia's national science agency, the Commonwealth Scientific and Industrial Research Organisation (CSIRO), and the University of Wales. Their research, "Poisoning the corrosion of magnesium," has been published in the journal Electrochemistry Communications.

Protecting a Wonder Metal

Magnesium alloy has gained in popularity as a "wonder metal" in the aviation, aerospace, automotive and electronics industries for its ultra light weight (35 percent less than aluminum and 78 percent less than steel) and strength. It is also highly recyclable and shows almost no dimensional change over time due to variations in temperature or vibration.

One of its major downsides, however, has been its vulnerability to rapid corrosion.

“Magnesium products are rapidly evolving to meet the demands industry, but presently are hindered by high corrosion rates," Birbilis says in a research announcement.

The article says the cathodic poisoning resulted in 10 times less hydrogen evolving during corrosion.

Figures: Electrochemistry Communications
Electrochemistry Communications

Optical micrographs show the contrasting fates of untreated (left) and "poisoned" magnesium (right) after 24 hours of immersion in a salt solution.  At right, "a substantial portion of the surface left un-attacked," the authors report.

"To date, no alloying additions to Mg suggest that a reduction in corrosion rate can be imparted," the team's article says. "[H]owever we reveal for the first time that alloying additions of arsenic can impart significant corrosion resistance to Mg via retarding the cathodic reaction."

New Applications

Once available in a more stainless, or corrosion-resistant form, wider magnesium use will lead to significant weight and energy savings in transportation industries, Birbilis said. The arsenic effect is now being trialed as a functional additive to existing commercial alloys, the team says.

“Our breakthrough will help develop the next generation of magnesium products, which must be more stainless,” he said.

Birbilis said the discovery would open the way to more research in creating 'stainless' magnesium products by exploiting other cathodic poisons.

"This is a very important and timely finding," he said. "In an era of light-weighting for energy and emissions reductions, there is a great demand for magnesium alloys in everything from portable electronics to air and land transportation."

   

Tagged categories: Additives; Aluminum; Cathodic protection; Corrosion protection; Engineers; Metals; Research; Steel; Transportation

Comment Join the Conversation:

Sign in to our community to add your comments.

Elcometer, Inc.
Elcometer 106 Pull-Off Adhesion Tester

Portable, easy to operate; Provides numerical value for adhesion; Comes in carrying case - Ideal for site tests; No power supply necessary.


Fischer Technology Inc.
DUALSCOPE®FMP100 with DataCenter IP

Transfer customized inspection plans from PC to FMP100 using step-by-step guidance with prompts and pictures throughout the measurement procedure


SSPC: The Society for Protective Coatings
http://www.sspc.org/

Join SSPC and Enhance
Your Career !


Midsun Specialty Products
Stopaq 30+ Year Coatings

Use Stopaq corrosion prevention coatings on pipelines, field joints, tank chimes, structural steel and more. Learn more at www.midsunsp.com/stopaq


KTA-Tator, Inc. - Corporate Office
KTA-TATOR LABORATORY SERVICES

• Coating failure analysis
• Independent
  comparative testing
• Accelerated
  weathering testing
• Toxic metals testing
• A2LA Accredited
800-245-6379


Specialty Products, Inc. (SPI)
SIGN UP TODAY – HANDS ON TRAINING

After 40 years in the coating business, SPI has trained more industry professionals than any other polyurea manufacturer. Now offering more classes at more locations than ever before!


HoldTight Solutions Inc.
NO FLASH RUST -
NO CONTAMINANTS

Our HoldTight®102 salt remover & flash rust preventer prevents flash
rust by removing surface contaminants. It has no equal; only wannabees.
Contact us for your
nearest distributor.
(800) 319.8802 sales@holdtight.com


Modern Safety Techniques
Modern Safety Techniques

See our Low Temperature Catalyst for your CO removal needs. Help to provide your workers with safe, comfortable breathing air!


Graco Inc.
Graco M680 Mortar Pump

Compact and portable. Great for concrete resurfacing and repairs. Handles mortars, cementitious and filled materials.
Call 877-844-7226 or info@graco.com.


Thermion Inc
Buy Back Program

We are offering $5,000
credit for your old Model
This drive system is
being discontinued by
the manufacturer.
More information at
thermioninc.com
877.884.3428

 
 
 
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