Anodizing Clinic
Larry Chesterfield

Larry Chesterfield

Larry Chesterfield (Aluminum Anodizing Consulting) discusses issues such as anodizing, stripping, cleaning and pretreatment, and quality control. Please select a topic from the list below.

Got a question or comment for Larry? Send him an email.

The latest from the Anodizing Clinic

Racking Without Visible Rack Marks

What is the process of racking a machined part to be anodized with no visible rack marks?

Ask an Expert Published: February 03, 2014

Food-Grade Anodic Coatings

Anodizer looks for certification that an anodic coating is safe to use with food.

Ask an Expert Published: January 27, 2014

Appearance of Clear Anodized Coatings on 6061 Alloy

How do you achieve clear anodizing that is bright and clear?

Ask an Expert Published: January 20, 2014

Protection from Laser Marking on Aerospace Parts

We have a number of aluminum alloy aerospace products that are finished using either chemical film (MIL-C-5541) or anodizing in accordance with MIL-A-8625. Do we need to touch up the areas where laser markings have been placed in order to preserve the corrosion protection?

Ask an Expert Published: October 25, 2013

Clear Anodize as a Paint Base

Our parts are generally Type III (hardcoat) anodized, sometimes duplex-sealed and sometimes unsealed. Our end-products are subject to sea water, and we try to adhere paint and polyurethane potting compounds to some of the parts. Would paint adhesion or adhesive bonding be enhanced by abrasive blasting prior to anodizing, maybe at 30 to 60 grit?

Ask an Expert Published: October 23, 2013

Pitting on 7000 Series Al Alloy

In the last year, we’ve had a string of anodized parts come back from the finisher that are “pitted.”

Ask an Expert Published: July 26, 2013

Black, Pitted Areas on Anodized Parts

We anodize aluminum cookware and have recently been getting parts with black pits scattered all over them. What is this and how might it be happening?

Ask an Expert Published: May 06, 2013

“Water-Break-Free” Test

What is a “water-break failure” test?

Ask an Expert Published: May 03, 2013

Sealing Parts After Two Months

Is it possible and practical to seal hardcoat anodized (Type III) parts that have been in storage for about two months?

Ask an Expert Published: April 29, 2013

Anodize Cooling System Design

What material would you recommend for the chilling system that I need to install for my anodizing tank, which has a capacity of 1,800 L (475 gal)? Can I go for Type 316 stainless steel or copper pipe with lead plating?

Ask an Expert Published: April 22, 2013

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