Pollution Forecasts for Delhi
An advanced notification system on daily air quality is developed for the National Capital Region (NCR) of Delhi, under the "Clean Air for Delhi 2010 and Beyond" program. The program is being developed with technical collaboration between two French firms - Aria Technologies SA and Leosphere SA, and the Central Pollution Control Board (CPCB) in Delhi, India, with financial support from the Government of France. The system is now operational and delivering valuable information in support of the Commonwealth Games in October, 2010.
The Aria Technologies SA have previously developed similar system for Beijing, which became operational during the Olympic games in 2008 and are also developing one for Rio de Janeiro (Brazil) as part of the Olympics 2016 preparations. <more>
Automatic Coating Limited/Pipe Viper International announces completion of eight digs in Strathroy utilizing new green technology
SCARBOROUGH, ON, Oct 6 /CNW/ - Automatic Coating, a world leader in liquid and powder coating in North America announced today it has successfully completed a pipe stripping project for Union Gas utilizing an environmentally friendly mobile pipe stripping unit. Union Gas is an integrated natural gas storage, transmission and distribution company serving approximately 1.3 million customers, and is a Spectra Energy company. Spectra Energy Corp (NYSE: SE), a FORTUNE 500 company, is one of North America's premier natural gas infrastructure companies serving three key links in the natural gas value chain: gathering and processing, transmission and storage, and distribution. <more>
New York City Installs 1 Million Square Feet of Cool RoofsThursday,
21 October 2010
Over the past year, more than 1,500 volunteers have applied white, reflective coatings to 1 million square feet of New York City rooftops to help reduce cooling costs, energy usage and greenhouse gas emissions.
The NYC °CoolRoofs program is a collaboration with NYC Service--an initiative launced by Mayor Michael Bloomberg to target more volunteers towards areas of need.
The program will help the City’s efforts to reduce greenhouse gas emissions by 30% by 2030, a primary goal of PlaNYC, the City’s comprehensive sustainability plan.
“Through NYC Service we are tapping into the incredible spirit of volunteerism in our city and harnessing that energy to tackle some of the challenges government can’t solve on its own and that includes reducing the city’s carbon footprint,” said Mayor Bloomberg. “By simply applying a reflective, white coating, we can reduce rooftop temperature by up to 60 degrees, which translates into reduced cooling costs and reduced carbon emissions.”
MI Probes Paint Spill into Muskegon River
Michigan environmental officials are investigating the accidental discharge of 18,000 gallons of black-water-based paint by a steel components plant in Big Rapids City.
No injuries were reported in the spill Saturday night from the facility owned by Haworth Inc.
The company said most of the paint had been contained within the Big Rapids sewer treatment facility, while “a small amount” spilled into the Muskegon River.
In a later news conference, however, the company’s senior environmental engineer conceded that the company did not know how much of the spill ended up in the river. <more>
Surface Finishing Expo China 2011
The Organizing Committee of SF EXPO China had showcase in SFCHINA 2010 and profound talk with many exhibiting companies, partners and industrial media around the world.
Networking with International Association and Media Partners
The committee met the representatives from Australasian Institute of Surface Finishing, Korea Plating Industry Cooperative, Taiwan Surface Finishing Association, National Association for Surface Finishing and Singapore Surface Engineering Association, exchanging opinions with them on organizing exhibitors and delegations to SF EXPO China 2011 and the concurrent seminars, as well as how to promote the show overseas.
Networking with companies
The committee talked with many companies such as Atotech, Winstar, MacDermid, Fengfan Chemical, Columbia Chemical, Wagner, Nordson, ITW-Gema, Guanson and Hawking. The biennially-held SF EXPO China is well recognized by these renowned companies in surface finishing industry and their participation will be confirmed in the near future.
The Organizing Committee had showcase to maximize the exposure of SF EXPO China in the industry. About 30, 000 tickets and invitations were distributed and enormous information about professionals was collected.
The next SF EXPO China will take place on May 11-13, 2011 in Guangzhou Convention and Exhibition Centre. Welcome you to join us!
Ms. Wing Lau
International Marketing and Public Relation
Organizing Committee of SF EXPO CHINA
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"Ask Joe Powder"
"Ask Joe Powder" is a question and answer column authored by Kevin Biller of the Powder Coating Research Group. Mr. Biller has over 30 years experience formulating and manufacturing powder coatings. He welcomes your questions regarding powder coating technology. Please write to: firstname.lastname@example.org
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I have a correction and an apology to make. In the last edition of Powder Coated Tough I made an error in not acknowledging the source of some very clever technology. A reader had asked me if I could provide some options to powder coat non-conductive articles. I presented two approaches, one using a solution of quaternary salts another using an iodine based solution. I neglected to state that the latter is the brainchild of Kevin E. Stay, the president of NOVOC Solutions ( www.novocsolutions.com ) located in Sparta, WI. Kevin has pioneered this technology and NOVOC offers this as part of their comprehensive powder coating services for conventional and non-conventional substrates. It is also very important to note that this technology is covered by two United States patents (please see: US Patents No: 6,620,463 and 6,855,429). If you have an interest in a powder coating articles that have a non-conductive surface I heartily encourage you to contact Kevin Stay at email@example.com or (608)386-7254.
We met at the NAI convention this week and it was my pleasure. I was already a fan of “Joe”
but did take in your conference and was impressed and enlightened by UV cured powder
coat. It was very nice to meet the writer behind my favorite technical column.
My question for you today is about Stainless.
I know… I know….
You can’t paint stainless!
Well you can but, will it last and for how long?
First I will take you through the process.
Decorative austenitic stainless is sandblasted, degreased, and put through a passivation process
ASTM A 967-05, rinsed with city water (conductivity tested) dried and powdercoated with an
Acrylic powder cured at 375 degrees for 10-20 minutes.
We have and would like to continue powder coating certain applications of stainless for some
outdoor use where other substrates would fail.
We are aware of the risk of not being able to hold the bond between the two, and so far the
test panels do pass the scratch test.
Q1: What other testing can do that would give me an insight to their well being in the field?
Q2: How long of a bonded life should be expected.
I now that there are all kinds of ASTM standard tests, but most would either apply for the
pretreatment process or the paint itself.
We already know that our passivation process is good and that our coating measures up, but
together we just do not know.
Thanks again, you are always a help.
Thank you for the kind words. It was also a great pleasure meeting you at the show. I was pleasantly surprised at the immense turnout and the high level of interest in new technology.
Regarding your questions, first of all you obviously have done your homework and have a good handle on how to process parts on a finishing line. Many finishers run scared from even contemplating applying a coating to stainless steel. There are a number of advantages to coating stainless including protecting the surface from staining and attack from fingerprinting and other sources of acidic oils. I see no reason not to powdercoat stainless steel as long as you properly prepare the substrate before applying the powder coating.
The process you describe for pretreating the stainless is right on the money. Sandblasting followed by a thorough, well controlled alkaline degreasing step provides a micro-rough profile to enhance adhesion of the powder. The degreasing step is essential to remove any residual oils, process fluids and handling contaminants. Furthermore using a passivation process ensures the removal of any iron based residues on the stainless surface as well the possible presence of sulfides left on the surface of some grades of stainless steel. Trace amounts of either contaminant can act as sites for subsequent corrosion.
(For our readers, the passivation of stainless steel typically involves immersing the part in a nitric acid bath although nitric acid/sodium dichromate or citric acid types of solution can also be used. The concentration of acid can range from 20 to 50% by volume. ASTM A380 describes standard practices for passivating stainless steel.)
After dry-off it is wise to powder coat the passivated surface as soon as possible. Chemically pretreated surfaces have a finite shelf life before they begin to degrade. It is also essential to ensure that the powder coating is applied to a reasonable thickness as specified by the powder coating supplier. Usually 2.5 to 3.0 mils are sufficient for an outdoor application. It is also critical to ensure that the parts see enough temperature and time to complete the cure to the powder coating chemistry. When a powder supplier quotes a recommended bake, they are referring to the time at or above the stated temperature that the part has reached. So it is important to factor in the heat-up time needed to reach the bake temperature.
As for ensuring acceptable coating performance in the field, I can recommend a couple practical tests. I suggest that you prepare a few test panels that have been run through the entire cleaning/passivation/coating/curing process and perform the following tests:
1. Simple “X” cross dry adhesion. Do this by cutting a 40 mm by 40 mm “X” into the coating with an Xacto knife. Apply a strong tape such as 3M 250 or Permacel #99 and pull sharply. The coating should exhibit little or no loss of adhesion. A similar test can be done with a “crosshatch” as described in ASTM D3359. This entails a perpendicular series of cuts that create a grid. I find that the simple “X” cut is usually sufficient to tell if the adhesion is acceptable.
2. Hot water immersion adhesion – Place the samples evaluated in the adhesion test described in test number 1 into a bath of 75°C (167°F) for 24 hrs. Allow them to dry then recheck for tape adhesion. Again the coating should show little or no loss of adhesion.
3. I would back these test results up with a 500 hrs salt fog (ASTM B-117) or humidity test (ASTM D2247). Place scribed test panels in the respective chambers and evaluate every 250 hrs. Most powder coatings can endure 1000 to upwards of 4000 hrs of humidity and salt fog resistance, but 500 hrs is what I consider a minimum benchmark.
As for the longevity of the coating in the field – so much of this depends upon the environment in which it is exposed. In addition the chemistry of the coating will have a huge effect on durability. As a rule of thumb you can expect the following performance in the field based on exposure in south Florida (failure is considered chalking and discoloration):
Epoxies – 1 to 3 months
Hybrids – 2 to 4 months
“Standard” Polyesters and Polyurethanes – 18 to 24 months
“Superdurable” Polyesters and Polyurethanes – 5 to 10 years
Acrylics – 5 to 10 years
Fluoropolymers – 10 to 25 years.
Differences in performance exist between formulas of similar chemistries due to pigmentation and additives used for gloss and surface properties so it is important to get the performance expectations from your powder supplier.
So if you are using a high quality acrylic and applying it clean and passivated stainless steel I would expect the coating to hold up for 5 to 10 years in a reasonable outdoor environment.
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