In the standard tabor abrasion tester, hard anodized aluminum exhibits only half the wear that cyanide case hardened steel. Aluminum anodizing is used widely in aerospace, automotive, defense, and medical applications. Mila8625f anodic coatings, for aluminum and aluminum alloys. Type ii is the conventional sulfuric acid anodize which can be decoratively dyed nearly any color and results in a thickness of 0. Techmetals has over 50 years experience in titanium and aluminum anodize, assisting a variety of industries like the medical, aerospace and automotive fields for instance. Mila8625, anodize, aluminum anodizing is an electrochemical process that converts the metal surface into a decorative, durable, corrosionresistant, anodic oxide finish.
Anoplate has the capability of treating the aluminum parts either chemically or mechanically prior to anodizing to achieve a matte nonreflective finish. Anodized aluminum makes it attractive, provides a durable exterior like curtain walls, roofs, loor escalators, ceilings. Hardcoat anodizing type iii precision coating medical. For small quantities we are not able to do this process now. The resulting anodized film is electrically nonconductive. Mila8625 there is also a type i anodizing, but this is done using. Anodizing 483 additives, temperature, voltage, and amperage. This specification covers the requ two classes of electrolvticallv formed anodic coat aluminum alloys for nonarchitctural applications. Mil a 8625, anodize, aluminum anodizing is an electrochemical process that converts the metal surface into a decorative, durable, corrosionresistant, anodic oxide finish. Email quotes, mila8625, ty2, mila8625, ty3, milc5541, ty1a, milc5541, ty3.
Let anodizing industries quote your metal finishing needs. Mil a 8625 aluminum anodic coatings mil a 8625 is the military specification for anodic coatings for aluminum and aluminum alloys. We also provide hard coat anodizing mila8625 type iii. Mil a8625 type ii, class 1 clear mil a8625 type ii, class 2 colored mil a8625 type iii, class 1 clear mil a8625 type iii, class 2 colored we are an approved supplier for. Anodized finishes have made aluminum one of the most respected and widely used materials today in the production of thousands of consumer, commercial and industrial products. Several conventional anodizing processes and their resulting properties are shown in table 1. We offer excellent service with pick up and delivery. Hardtuf is a proprietary anodizing process developed by. As a frame of reference, however, 2024 aluminum base metal has a hardness in the range of 6070 rockwell b, where type iii anodize has a hardness of 6070 rockwell c.
Despite the benefits of anodized coatings, it is pointed out that they have been shown to adversely affect the fatigue performance of the underlying alumi nun1 alloys l31. Mila8625 type ii, class 1 clear mila8625 type ii, class 2 colored mila8625 type iii, class 1 clear mila8625 type iii, class 2 colored we are an approved supplier for. We have a problem with hard anodize wearing through on a 7075t6. Type i is chromic acid anodising, type ii is sulphuric acid anodizing, and type iii is sulphuric acid hard anodizing. All linetec anodize finishes are a class i coating, with the exception of ano204 clear, which is a class ii coating. Nov 15, 2018 type ii anodize results in a thickness of around. Mil a 8625 type ii, class 1 clear mil a 8625 type ii, class 2 colored mil a 8625 type iii, class 1 clear mil a 8625 type iii, class 2 colored we are an approved supplier for. Microhardness tests on hard anodized aluminum typically give values of 500 to. On some alloys, the color of nondyed mila8625 type iii class.
Aluminum anodizing is an electrochemical process that creates a thin aluminum oxide film on the surface of aluminum substrates. Type ii clear and all colors type iii hard anodize ams 2468, ams 2471, mila8625. It is a thin gray film that is not as corrosion resistant as sulfuric acid anodize. However, hard anodizing is commonly performed clear or with a black dyed finish, though some prefer the aluminum dyed different colors for aesthetic purposes. I i i coatingtype i coating height mgft2 i 1 and ib 200 minimum ic1 200minimum 700maximum i ii. Delete milc81706 chemical conversion materials for coating aluminum and aluminum alloys. Design and application guide for anodizing aluminum. These coatings, with the inherent hardness of aluminum oxide, are thick enough for use in applications involving rotating parts where. Mila8625 aluminum anodic coatings mila8625 is the military specification for anodic coatings for aluminum and aluminum alloys. This oxide layer acts as an insulator and can be dyed in a. Avoid hot water, which may partially seal the anodized coating.
Anodic coatings for aluminum and aluminum alloys this amendment forms a part of mila8625f, dated 10 september 1993, and is approved for use by all departments and agencies of the department of defense. Mil a 8625 aluminum, copper, steel, stainless steel, titanium, chromium, nickel mil a 8625f, military specification. We are compliant with type ii and iii, class 1 and 2 mila8625 and milc5541. I think you said that the anodizer you spoke with offered this as an alternative to type i. Type iii sulfuric acid anodizing at 36f with a coating thickness of 2 2. Rinse thoroughly in ambient water and allow to air dry. P41la86251 30 superseding mila8625c 15 january 1968. When the test is extended to 100,000 cycles, the superiority of hard anodized. Clear anodize is available in both class i and class ii. The hard ano dizing processes produce coatings from 25 ktm 1 mil to more than 100 l, tm 4 mils thick.
Established in 1947, automatic anodizing has been working hard to meet all of your aluminum finishing needs through bright dip anodizing, clear anodizing and color anodizing plus hard. In addition to the aa designation system, three other designation or specification systems are in common use. Generally speaking, type iii anodizing is produced using higher current densities and higher voltage than type ii coatings. Type i is chromic acid anodize or chromic alternatives which are very thin on the order of 0. In addition to the reasons above, aluminum anodizing also offers some aesthetic benefits. Anodized aluminum parts are used in many consumer products, building materials, and home. These are the alumilite finishes nomenclature originated by alcoa, military specification mila8625 most current f version as of april 2000 and aac1119 automotive standard. It turns the aluminum surface very hard than when a conventional paint is used. The resulting anodized film is electrically nonconductive, protects the aluminum against corrosion and is resistant to wear. Safs capabilities for military specification anodizing mila8625. It provides details, methods, and procedures for these various coatings.
What is the typical hardness for mila8625, type iii, class 2 coatings. Mila8625 aluminum, copper, steel, stainless steel, titanium, chromium, nickel mila8625f, military specification. Type iii anodizing is an abbreviation derived from the military standard mila8625 type iii category. The most widely used anodizing specification in the us is a u. Undyed, that is class 1, hardcoat anodize will change the color of the aluminum dependent on the particular alloy and. Aac application guideline for selection of hard anodic. Aluminum is ideally suited to anodizing, although other nonferrous metals, such as magnesium and titanium, also can be anodized. Aluminum anodizing is typically referred to by its three types. Further, the aluminum alloy used for the application should be discussed with the anodizer before production to choose the most.
My company fabricates aluminum and steel pedestrian bridge railing among other bridge parts. Techmetals has over 50 years experience in titanium and aluminum. Techmetals has over 50 years experience in aluminum anodizing, both type ii and type iii hard coat anodize. We have a problem with hard anodize wearing through on a 7075t6 aluminum part that gets heavy wear. There are many advantages of using anodized aluminum parts to manufacture commercial, industrial and consumer products. Hardcoat anodize mila8625 type iii 3 aluminum anodizing. Aluminum anodizing is an electrochemical process in which an oxide anodic layer is chemically built on the surface of the metal. As indicated in the table, depending on the process chosen, an anodizer can impart to the surface of the aluminum item specific properties as desired, depending on the end use. Effect anodized coatings on fatigue strength in aluminum alloy. Mil a8625 aluminum, copper, steel, stainless steel, titanium, chromium, nickel mila8625f, military specification.
Industrial finishing services industrial finishing types menu. This mil spec covers the requirements for electrochemicallyformed anodic coatings on aluminum and aluminum alloys for nonarchitectural applications. Aluminum hard anodizing, also known as mil a 8625 type iii or engineered anodizing, is similar to standard anodizing in that both are controlled electrochemical processes. Mila8625f anodic coatings, for aluminum and aluminum. Whats the appearance of hardcoat anodize mila 8625 type iii. The image below is one of my cnc hold down clamps that has been anodized and dyed red. Anoplate can certify this finish to mil a 8625 type ii both class 1 and class 2, as well as many unique customer specifications. Hard coat anodizing services mila8625 type 3 aluminum. May 01, 2010 mila8625, type iii anodic coatings are also referred to as hardcoat anodized finishes. Anodized coatings are com monly applied to aluminum alloys to provide corrosion and wear resistant sur faces. Undyed, that is class 1, hardcoat anodize will change the color of the aluminum dependent on the particular alloy and the anodic thickness. In the standard tabor abrasion tester, hard anodized aluminum exhibits only half the wear that cyanide case hardened steel shows after 50,000 cycles in the abrasion tester.
The aluminum object itself serves as the positive electrode. An aluminum oxide coating for improving the hardness, lubricity and corrosion resistance of aluminum and aluminum alloys. Fort wayne anodizing reference manual its not how its made. Hard anodizing is generally used for applications that need a corrosion, abrasion, or.
For example, the color of the aluminum after being hard coat anodized depends on the alloy and the thickness of the coating. Most anodizing on machined parts are of two commonly specified types. Military specification anodizing mila8625 saf southern. I i i coatingtype i coating height mgft2 i 1 and ib 200 minimum ic1 200minimum 700maximum i ii minimum. The hard ano dizing processes produce coatings from 25 ktm 1 mil to more than 100 l, tm 4 mils. The anodizing of aluminum is a popular process that improves the metals durability, resistance to corrosion and scratching.
Type ii or regular sulfuric anodizing and type iii hardcoat or hard sulfuric anodizing. Aluminum anodizing anodized aluminum type ii anodizing. The color of the aluminum after being hard coat anodized depends on the alloy and the thickness of the coating. Mil a 8625 specifies a test for abrasion resistance to accommodate these challenges. Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts the process is called anodizing because the part to. Conventional type iii aluminum anodizing uses a high voltage process up to 100v to create the oxide layer. Anodic coatings for aluminum and aluminum alloys this amendment forms a part of mila8625f, dated 10 september 1993, and is approved for use by all departments and. Established in 1947, automatic anodizing has been working hard to meet all of your aluminum finishing needs through bright dip anodizing, clear anodizing and color anodizing plus hard coat anodizing with teflon option. This is lowtemperature hardcoat, and we will quote if the quantity is large. Arrow cryogenics offers standard mila8625 type ii aluminum anodizing at our stateoftheart facility in blaine, minnesota.
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