Anodizing Clinic
Larry Chesterfield

Larry Chesterfield

Larry Chesterfield is president and owner of Anodizing Technologies Inc. With 21 years in business, ATI designs, builds and installs turnkey facilities for aluminum anodizing, titanium anodizing and other metal finishing processes. The company prides itself on providing more than just anodizing equipment—service extends to project management and anodizing technical consulting.

Prior to ATI, Larry was on the other side of the business—he spent 25 years as owner-operator of a large job shop aluminum anodizing, electrostatic painting and aluminum fabrication business.

Larry is also the co-inventor of a patented anodizing process called “High Absorptance, High Emittance Anodic Coating,” a passive thermal control coating used on the International Space Station. The anodized coating controls the surface temperature of aluminum tool bodies and other parts affixed to the exterior of the space station that are subject to thermal changes between the light and dark sides of earth orbit. This makes these space station maintenance tools safe for the astronauts to handle

Larry holds a California “Class A” contractor’s license and has been an active member of the Aluminum Anodizers Council for many years, and has authored various technical papers about anodizing.

Got a question for Larry? Send him an email.


The latest from the Anodizing Clinic

Anodizing Clinic: Water Quality in the Anodizing Process

Q. I would like to know more about the physical and chemical parameters that are used to evaluate the quality of water used in the anodizing process. What are the standard limits of water quality for each step in the process? Also, why do we need to check for silica on the process water?

Ask an Expert Published: January 01, 2017

Anodizing Clinic: Sealing with Distilled Water

Q. Can distilled water be substituted for deionized water? Our facility can create a distilled water heated bath fairly easily because we already produce distilled water for another process. A DI water bath would be much more expensive. 

Ask an Expert Published: January 01, 2017

Anodizing Clinic: Painting Parts After Anodizing; Seal, or No Seal?

Q. In conversations with our anodizer on the best way to seal parts for adhesion prior to painting, he referred to a choice of either a final hot water immersion at around 120°F with no seal or a hot water seal at a much higher temperature. What is the difference between the two options and which one do you think is more advantageous for paint adhesion?

Ask an Expert Published: December 28, 2016

Anodizing Clinic: Measuring Color of Coatings with a Colorimeter

Q. Recently, a company asked us to match its samples so we could do work for them. According to our method, we matched the samples, but they were rejected when they were sent to the company. We were told the samples were out of tolerance. We discovered the company used a different brand colorimeter with a different color scale to measure the color. Is there a set standard in the anodizing industry for measuring and matching colors?

Ask an Expert Published: December 01, 2016

Anodizing Clinic: Anodic Coating Blistering on 7075 Alloy

Q. We have recently run into a surface condition when hard anodizing 7075 machined forgings. It seems to be present primarily on the end of the part, even down into the hole. Both of these areas are machined. The condition does not appear to be evident on other surfaces. I have not seen this condition before, but it appears to me to be rather unique and something recognizable.

Ask an Expert Published: December 01, 2016

Anodizing: Corrosion on Hardcoat Anodized 7000 Series Forging

Q. I sent you photos of two parts that are alloy 7050 forgings. On these parts there are spots that appeared as a result of Type III (hardcoat) anodizing that were not present before anodizing. They look like corrosion of some sort, but the corrosion looks a little different on each part. What causes these spots to appear and what measures can be taken to prevent or eliminate them after they occur?

Ask an Expert Published: November 03, 2016

Parts Cleaning Clinic: Cleaning of Inconel

Q. What cleaning methods are recommended for finishing Inconel 718? Can this material be passivated or utilize the Summa process as 300 and 400 series stainless steel, or is there another way to remove the contaminants in regards to machining parts to size?

Ask an Expert Published: November 01, 2016

Parts Cleaning Clinic: Phosphate Coating Problems

Q. We electrocoat sheet metal, iron castings (machined and non-machined) and aluminum castings (machined and non-machined surfaces) and are having problems with poor phosphating on aluminum substrates. We maintain the free acid at 0.7-1.1 points and total acid at 20-24 points, and the total fluoride at 1,500 ppm. Bath temperature is 40°C to 45°C. Any suggestions?

Ask an Expert Published: November 01, 2016

Parts Cleaning Clinic: Pretreatment Equipment Suppliers

Q. I am researching manufacturers of aqueous part washers and phosphate pretreatment systems for powder coating, looking for companies that build conveyor systems, washers and treatment systems; not parts washers. The parts to be cleaned are various sizes of steel, stainless and aluminum fabrications from stampings, cut to length steel tubing, and sheet metal fabrications up to 6 feet long and 3 feet wide. What are my options?

Ask an Expert Published: November 01, 2016

What’s New in the Defend Trade Secrets Act of 2016

The Defend Trade Secrets Act (DTSA) of 2016 passed with overwhelming support and the Act is now effective, impacting how a company can protect its assets. Below is a recap of what is new and what every company should be looking to do in light of this new law.

Ask an Expert Published: October 01, 2016

Plating Clinic: Adhesion of Brush Plated Deposits

Q. How well does a brush-plated deposit adhere to the base metal?

Ask an Expert Published: September 01, 2016

Anodizing Q&A: Black Dyed Parts Require Excellent Lightfastness

How long does an 8-rated dye last?

Ask an Expert Published: May 01, 2016

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