Wednesday, July 30, 2014
PLACERVILLE, CALIFORNIA
99 CENTS

New coating for aluminum developed

By
From page B1 | November 26, 2012 |

RENO, Nev. – A research team at the University of Nevada, Reno has developed a new environmentally-friendly coating for aluminum to replace the carcinogenic chromate coatings used in aerospace applications. The chromate conversion coatings have been used for more than 50 years to protect aluminum from corrosion.

Attempts to replace chromate coatings with non-toxic coatings have been under way since the 1980s.  The awareness on effects of chromates was brought to the forefront in 1993 by the real-life incident involving Erin Brokovich and depicted in the movie released in 2000 of the same name. Although the use of chromates for consumer and automotive applications has been banned, it is still in use by the defense and aerospace industries under various exemptions.

The carcinogenic coatings were exempted from the ban due to unavailability of suitable replacement combined with the high human and financial cost of failure from corrosion. The search for a suitable replacement has been elusive primarily due to one main characteristic of the coating referred to as “self-healing,” the ability of the coating to heal itself after being damaged or scratched.

When scratched, the coating components from nearby sites migrate to the damaged region and re-protect the underlying alloy. A short video of the coating formation is on Chidambaram’s Website, www.electrochemical.org/ under the heading “Cool Videos.”

Chidambaram’s formulation performs comparably to the chromate formula in its ability for self-healing, which is important to the defense and aerospace industry. The coating can be applied to all aluminum products. The new formula creates an environmentally-benign molybdate-based coating that provides corrosion protection to aluminum, used for aircraft and spacecraft. These coatings, when damaged, will re-heal themselves.

The University of Nevada, Reno team developed and tested more than 300 coatings before arriving at this formulation. They used a complimentary suite of advanced surface analytical techniques such as Raman microspectroscopy, Fourier transform infrared spectroscopy, energy dispersive spectroscopy, secondary ion mass spectroscopy and X-ray photoelectron spectroscopy to conclusively prove the presence of molybdate in the scratched region.  Further, using electrochemical testing, the team showed the coating re-protected itself via self-healing upon scratch test.

Comments

comments

Mike Wolterbeek

.

News

 
District 2 candidate statements tell of goals

By Dawn Hodson | From Page: A1

Sand Fire nears containment: 66 structures destroyed

By Cole Mayer | From Page: A1 | Gallery

 
Schedule for Highway 50 blasting closures

By News Release | From Page: A3

Tails wagging over dog park approval

By Julie Samrick | From Page: A3

 
Quarter-acre fire in Kelsey

By Rebecca Murphy | From Page: A3

.

Opinion

My Turn: Privatization of public services

By Mark Belden | From Page: A4

 
Policy book

By Mountain Democrat | From Page: A4

 
.

Letters

Piano replaced

By Letters to the Editor | From Page: A5

 
Comments sign-in policy

By Letters to the Editor | From Page: A5, 1 Comment

Save the Guinea Worm

By Letters to the Editor | From Page: A5, 1 Comment

 
Large bangs

By Letters to the Editor | From Page: A5, 2 Comments

Private property gets no respect

By Letters to the Editor | From Page: A5, 2 Comments

 
District 2 supervisorial special election

By Letters to the Editor | From Page: A5, 4 Comments

GDPUD management report

By Letters to the Editor | From Page: A5

 
.

Sports

Ex-Bruin lends a helping hand

By Steven Shaff | From Page: A8 | Gallery

 
Sierra Sharks finish middle of the pack

By Democrat Staff | From Page: A8

Roundup: July 29, 2014

By Democrat Staff | From Page: A8

 
Taz pull through for SSL trophy

By Patty Pope | From Page: A8

.

Prospecting

Nuns discover a pleasant place

By Lexi Boeger | From Page: B1 | Gallery

 
Bargains can be found everywhere

By Democrat Staff | From Page: B2 | Gallery

At a glance: Game time

By Mimi Escabar | From Page: B2

 
Barbecue dinner to benefit Blue Star Moms

By Mount Aukum Winery | From Page: B2

Stagecoach story takes riders on a trip

By Wendy Schultz | From Page: B3

 
Help needed to make cool ties

By Sew 4 | From Page: B3

Stroke and osteoporosis screenings planned

By Life Line Screening | From Page: B3

 
Gold Rush Days activities cancelled this year

By Sacramento Convention And Visitors Center | From Page: B4

Master Food Preservers: Tomato time

By Monique Wilber | From Page: B4

 
Sacramento area museums offer summer fun

By Sacramento Association Of Museums | From Page: B5

 
Build an author platform at the Library

By El Dorado | From Page: B5

.

Essentials

Weather stats 7-29-14

By Michael Raffety | From Page: A2

 
Building permits 6/2-6/2014

By Michael Raffety | From Page: A2Comments are off for this post

Crime Log: July 17

By Cole Mayer | From Page: A2

 
.

Obituaries

Merlyn Wilbur Adams

By Contributor | From Page: A2

 
Wallace Murrel Thomas

By Contributor | From Page: A2

.

Real Estate

.

Comics

.

Women’s Health

Love the skin you’re in

By Noel Stack | From Page: WH4

Dump stress and improve your health, productivity

By Wendy Schultz | From Page: WH7Comments are off for this post

Women’s Health Expo

By Marshall Medical | From Page: WH8

Find the confidence you need to fight back

By Special to the Democrat | From Page: WH12

Our choices directly affect our health

By Special to the Democrat | From Page: WH14

They’re NOT your mother’s hearing devices!

By Marshall Medical | From Page: WH17