HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
REGISTER   |   LOGIN   |   HELP
News
Materials & Assembly

Multifunction Coatings Apply Harsh Environment Protection

NO RATINGS
< Previous Page 2 / 4 Next >
View Comments: Oldest First|Newest First|Threaded View
Page 1/2  >  >>
Beth Stackpole
User Rank
Blogger
The cost of coatings
Beth Stackpole   3/5/2012 6:47:48 AM
NO RATINGS
As you very adeptly lay out in this piece, Ann, coatings are playing a much bigger role in product designs of all sorts for a variety of reasons--for durability, for environmental reasons, for performance. That said, I imagine they add significant cost to a design, not to mention, require additional time on the part of the engineer to properly research and figure out what type of coating best addresses their particular design challenge. Any thoughts on how engineers can mitigate these additional costs with better design choices or processes?

apresher
User Rank
Blogger
Multifunction Coatings
apresher   3/5/2012 8:26:02 AM
NO RATINGS
Ann, Exellent article.  One of the interesting things with advancing technology in almost every discipline is making the connection between innovations and applications.  It just makes sense that multifunction coatings will increase performance and reduce costs, as long as engineers are educated on what's possible. That's a significant problem for personnel asked to wear many hats.  Thanks.

Ann R. Thryft
User Rank
Blogger
Re: The cost of coatings
Ann R. Thryft   3/5/2012 12:17:54 PM
NO RATINGS

Beth, for many (if not most) of these harsh environment apps, coatings are not an afterthought or seen as an addition, but are considered an integral part of the product. As such, the time and cost involved of particular coatings are weighed just like the time and cost of other aspects of manufacturing the product. The question isn't usually to coat nor not to coat, but which type of coating to use and how many of them.


Ann R. Thryft
User Rank
Blogger
Re: Multifunction Coatings
Ann R. Thryft   3/5/2012 12:21:58 PM
NO RATINGS

Al, I think you bring up an important point about the multiple disciplines an engineer must master, especially relating to materials: coatings and paints, fasteners vs or plus adhesives, metal and/or plastic/composite materials for the box or body of the object and if mixing those body materials, what should go where? On a larger scale, much of this complexity and these interacting decisions reminds me of PCB design issues.


Dave Palmer
User Rank
Platinum
Re: The cost of coatings
Dave Palmer   3/5/2012 1:38:44 PM
NO RATINGS
1 saves
Ann, thanks for a whirlwind tour through the world of coatings.  You covered a tremendous amount of ground in this article.

We have been doing a lot of work on finding suitable alternatives to chromate conversion coatings for marine applications.  Chromate conversion coatings do a great job of inhibiting corrosion on aluminum.  Rather than sealing the aluminum off from the environment, the presence of the chromate ion actually alters the chemistry of the corrosion reaction, slowing it down significantly.  Chromate conversion coatings are self-healing, and provide a great base for paint.  Unfortunately, hexavalent chromium is also a potent carcinogen.  Because of this, there has been an industry-wide effort to phase it out.

We have had some good success using the Alodine EC² coating described in the article.  This coating has many excellent properties.  However, there are also a number of challenges which come from the fact that it is an electrodeposited coating.  Among other things, this makes it difficult to coat the inside of tight passages.  So, while EC² has many advantages, it is not necessarily a "silver bullet" for every application.

We are continuing to look at some of Henkel's other non-chromate coatings.  Among these is Alodine 5200.  Like EC², it is a titanium oxide coating, but unlike EC², it is not electrodeposited.  Unfortunately, our initial findings were that the Alodine 5200 did not have as much corrosion resistance as a chromate coating.

However, this testing was done using an epoxy primer.  Since doing this testing, I've seen some data which suggests that Alodine 5200 may perform better than chromate when an acetoacetate primer is used, rather than an epoxy.  This points to the fact that it's important to look at the entire coating system (substrate, coating, primer, and paint), rather than just one component in isolation.

Of course, besides the many chrome-free products which Henkel makes, there are also a number of chrome-free products on the market from other manufacturers, including Metalast, Macdermid, and many others.

Coatings and corrosion are complex topics, and I continue to try to educate myself about them.  Just about anyone who is actually an expert on coatings works for a coating supplier, so it can be hard to find an unbiased opinion.  It's important to build up enough general knowledge to be able to evaluate the suppliers' claims about their products.  And, of course, there's no substitute for doing your own testing.

Ann R. Thryft
User Rank
Blogger
Re: The cost of coatings
Ann R. Thryft   3/5/2012 2:24:55 PM
NO RATINGS

Dave, thanks for weighing in on coatings, especially the health issues in chromate conversion coatings. You've got valuable information since it comes from an independent testing lab instead of from the suppliers. Although the suppliers of course want to tout their own products, I was pleased to find that most of them could be objective about many technical and industry issues.


Charles Murray
User Rank
Blogger
Re: The cost of coatings
Charles Murray   3/5/2012 7:06:34 PM
NO RATINGS
Good job detailing all the reasons for use of coatings, Ann. In the coatings market, is there one application for coatings that stands out above the others, in terms of raw numbers? Would it be anti-corrosion? 

Alexander Wolfe
User Rank
Blogger
Re: The cost of coatings
Alexander Wolfe   3/5/2012 7:21:05 PM
NO RATINGS
This is a great roundup, Ann. As from the considerable utility of the stuff you're writing about, your coverage is making this stuff interesting besides! Quite an achivement.

Ann R. Thryft
User Rank
Blogger
Re: The cost of coatings
Ann R. Thryft   3/6/2012 12:52:48 PM
NO RATINGS

Thanks for the feedback, guys. Chuck, I specifically looked at coatings that are targeted for harsh environments. And I didn't look for raw number volumes, just specific apps where these are used. Within those parameters, I got the impression that anti-corrosion is a big deal, maybe the biggest deal, for various reasons.


TJ McDermott
User Rank
Blogger
Re: The cost of coatings
TJ McDermott   3/6/2012 8:26:22 PM
NO RATINGS
Your impression is VERY accurate.  Stainless steel ISN'T.  It's corrosion-resistant.  Coatings can do better, but when put to use they must be monitored for wear.  As soon as a penetration occurs, be it through wear or external damage, the part must be replaced or recoated.

Ann, will you be covering FDA approval of coatings in any of your reports?

Page 1/2  >  >>
Partner Zone
Latest Analysis
Eric Chesak created a sensor that can detect clouds, and it can also measure different sources of radiation.
Festo's BionicKangaroo combines pneumatic and electrical drive technology, plus very precise controls and condition monitoring. Like a real kangaroo, the BionicKangaroo robot harvests the kinetic energy of each takeoff and immediately uses it to power the next jump.
Practicing engineers have not heeded Yoda's words.
Design News and Digi-Key presents: Creating & Testing Your First RTOS Application Using MQX, a crash course that will look at defining a project, selecting a target processor, blocking code, defining tasks, completing code, and debugging.
Rockwell Automation recently unveiled a new safety relay that can be configured and integrated through existing software to program safety logic in devices.
More:Blogs|News
Design News Webinar Series
3/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
2/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
12/18/2013 Available On Demand
11/20/2013 Available On Demand
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Apr 21 - 25, Creating & Testing Your First RTOS Application Using MQX
SEMESTERS: 1  |  2  |  3  |  4  |  5


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: April 29 - Day 1
Sponsored by maxon precision motors
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service