Hard Anodizing Aluminum Is Not Just for Cookware

Hard Anodizing Aluminum Is Not Just for Cookware

WADSWORTH, OH―The use of this engineering coating has grown dramatically over the decades since its commercial introduction into the aircraft industry. Today, hard anodizing of aluminum can be found on applications as diverse as gourmet cookware to the industrial marketplace.

“The anodic film gives aluminum superior resistance to abrasion and corrosion while retaining the numerous advantages of the aluminum, itself,” says Chris Jurey, President of Luke Engineering & Manufacturing Company. “The coating is also referred to as ‘hard coat’ or ‘Alumite Hard Coating’ or ‘Martin Hard Coating’ based on original patents given to the Alumite and Martin coating processes.

The Hard Anodized coating is aluminum oxide formed by the electrochemical reaction of aluminum with oxygen. The oxide growth is bonded chemically to the underlying substrate and is readily measurable.

“For two thousandths of an inch coating thickness,” adds Chris Jurey, “a growth of one thousandth will be experienced, while the other one thousandth found below the original surface is commonly referred to as penetration.”

The crystallized structure of the aluminum oxide is porous, made up of millions of tiny pores stretching from the base metal to the surface. It is this phenomenon that permits extensive buildup of the coating and the introduction of dyes and lubricants.

Luke Engineering's true low temperature hard coating process for aluminum, magnesium and their alloys creates a new metal that is harder and light weight―often replacing hardened and stainless steel, chrome plating, brass or ceramics. Luke Engineering is a leading supplier of hard anodizing for die castings and are well known for our ability to hard anodize large parts.

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