The chemical conversion coatings are of the following types. Milc82 may react violently with highly reactive materials such as alkali and alkaliearth metals, e. Chem corrosion resistant coating part number milc5541 nsn 8030014510284. Chemfilm nadcap accredited chemfilm, sometimes called aluminum chromate, alodine or iridite, is a chemical conversion coating that is used to passivate aluminum. Milc26074c 3 my les5 military specification this specification ie approved for we by all departfmnta and agencie8 of the oapartmmt of defense. The trivalent chromium process tcp provides a non hexavalent chrome coating compliant with rohs, elv and weee directives. One side of the part is to be processed per milc5541, class 1a, then primed. Milc5541e, mildtl5541f, astm b 44993 2004, ams 2473g, ams 2474d and mildtl81706b. Chromate conversion coating chem film, also widely referred by the brand names alodine or iridite, is the application of a chromate conversion coating on aluminum alloys. Milc5541 chem corrosion resistant coating aerobase group. It protects aluminum substrates from corrosion and serves as a base for organic coatings while leaving dimensions unchanged.
Conversion coatings for aluminum meets requirements of military specifications. Mil dtl 5541 covers all chemical conversion coatings which are known to create protection through chemical reaction with metals like aluminum and aluminum alloy. The black chrome surface may be waxed ot oiled to darken the surface. The mildtl5541 specification current revision is mildtl5541f covers chemfilm aka alodine or chromate conversion on various aluminum alloys. This 100% hexavalentchromium free conversion coating exceeds the requirements of mil dtl 5541, and results in a harder, denser and more abrasion resistant finish than chromate coatings it replaces.
I have a person at work that thinks that type ii is colorless and is using type i with out really being needed to provide color i think he is confused with. Metallic coating, electroless nickel sae amsc26074, or mildtl32119 where. Mil c 5541e, mil dtl5541f, astm b 44993 2004, ams 2473g, ams 2474d and mil dtl81706b. Nov 29, 2014 the current specification 2009 is mil dtl5541f, which superseded mil c 5541e in july 2006. Mil c 5541 class 1a provides the heaviest coating, while class 3 is a lighter variation. Another important quality is the ability to heal small scratches due to being soluble. Chemical film chem film coatings are gelateneous films which provide some sort of a barrier medium to retard corrosion on aluminum surfaces and enhance adhesion of. Mil dtl 5541 chemical conversion coatings on aluminum and aluminum alloys this specification covers chemical conversion coatings formed by the reaction of chemical conversion materials with the surfaces of aluminum and aluminum alloys. The current specification 2009 is mil dtl5541f, which superseded mil c 5541e in july 2006. Electroless nickel plating an overview electroless nickel plating is offered by advanced plating technologies in both type iv medium phosphorous 69% p and type v high phosphorous 1014%. Type i is the traditional hexavalent chrome based coating that is most recognizable by its color that can range anywhere from yellow to gold to green to brown, and even clear upon request. Mil mil dtl5541f chemical conversion coatings on aluminum and aluminum alloys superseding mil c 5541e standard by military specifications and standards, 07112006 amendments available. This 100% hexavalentchromium free conversion coating exceeds the requirements of mildtl5541, and results in a harder, denser and more abrasion resistant finish than chromate coatings it replaces. Mil mildtl5541f chemical conversion coatings on aluminum and aluminum alloys superseding milc5541e standard by military specifications and standards, 07112006 amendments available.
Mildtl5541f 11 july 2006 superseding milc5541e 30 november 1990 detail specification chemical conversion coatings on aluminum and aluminum alloys this specification is approved for use by all departments and agencies of the department of defense. The only rohscompatible mil c 5541 compliant coating is tcp because thats the way mil c 5541 is written. Milc5541 mildtl5541 show complete document history. Mildtl5541 chemical conversion coatings on aluminum and.
Part number mil c 5541 including related part numbers and nsn starting at page 1. Type i compositions containing hexavalent chromium. The tcp process compares favorably with its hexavalent counterparts in providing a conversion coating on aluminum which meets or exceeds the requirements of milc5541, type 1a and type 3. Contact ens technology regarding chromate conversion coating mil dtl 5541 today. Qpl number 81706 milc5541 document id mildtl81706b, type ii, class 1a, form i, method c. Aluminum chromate conversion coatings aluminum chromate conversion coatings properties.
Aluminum chromate conversion coatings are amorphous in structure with a gellike composition hydrated with. Part number milc5541 including related part numbers and nsn starting at page 1. Iridite chromate conversion coating finish milc5541. Yellowclear iridite, mil c 55411 class 1a, 3, chemical films, chromate iridite, aluminum chemical film or chromate conversion is widely used. One side of the part is to be processed per mil c 5541, class 1a, then primed. As specified on drawing color is a dull gray, approaching black. Description 650 chromital tcp is a rohs, reach compliant and qpl approved liquid chemical used to form a protective conversion coating on aluminum surfaces without the use of hexavalent chromium. This was formerly known as milc5541 and is another of our alltime bestselling plating specs. Chromate leaves no measurable buildup, but provides excellent corrosion resistance.
Military specification this specification ie approved for. Milc5541 class 1a provides the heaviest coating, while class 3 is a lighter variation. Mildtl5541 covers all chemical conversion coatings which are known to create protection through chemical reaction with metals like aluminum and aluminum alloy. I have special request from a customer to meet the mil c 5541 class 3 in a gold or yellow rohs compliant chem. A print callout might read passivate per mildtl5541 type. Anodize sulfuric nondyed clear sulfuric acid anodize mil a8625 type ii, class 1 ams2471 astm b580 type b thru f 7. Mildtl5541 type i specifies hexavalent chromium bath while mildtl5541 type ii is normally achieved with a trivalent chromium bath. We are nadcap certified, as9100 c and itar registered. Chemfilm is applied by dipping, spraying or brushing. Anodize sulfuric nondyed clear sulfuric acid anodize mila8625 type ii, class 1 ams2471 astm b580 type b thru f 7. Report problem email mffp metal finishes and finishing processes and procedures. Electroless nickel plating per mil c 26074, astm b733 and ams 2404. Although alchrome tri tec claims to have a product that meets this. Milc5541 class 1a indicates maximum corrosion resistance and a more stringent corrosion test is specified.
Click here to download deoxidine material safety data sheet msds click here to download alodine 1201 material safety data sheet msds. Baychem offers high grade chemical products to meet all surface treatment and metal finishing requirements and can offer all these products in various packaging to meet your industry specific needs. Chemical film coatings are gelatinous films which provide some sort of a barrier medium to retard corrosion on aluminum surfaces and enhance adhesion of subsequent coatings such as paints and primers. The military specification referred to as mildtl5541, military specification, chemical conversion coatings on aluminum and aluminum alloys covers. Chem film chromate conversion coatings electrolurgy. Please use the below content for reference only the chromate process provides a clear iridescent to slightly golden iridescent film of low contact resistance. Clear chromate rohs compliant mil c 5541 type i, class 1a mil dtl 5541 astm b449 ams 2473 mil std 171 finish no. Im not having any luck with my current suppliers and have started questioning if such a coating exists. Alodine 1200 methods and properties are defined by mildtl5541f formerly. Electroless nickel plating per milc26074, astm b733, ams. Our facility houses large rack tanks capable of immersing parts up to 24.
Chromate conversion coating mildtl5541 post treated with a paint or. The military spec referred to as mildtl5541, military specification, chemical conversion coatings on aluminum and aluminum alloys. Mildtl5541 chemical conversion coatings on aluminum. Mil dtl 5541 also has established two types of chem film coating. Copper contacts are gold plated and rated for 3000 mate and demate cycles. My second choice to surrender would be mil c 5541, but my first choice would be color. Military specification this specification ie approved for we. Coatings of this type may be used, for example, on tanks, tubing and component structures where paint finishes are not required for. It shall approximate color plate 37038 of fed std no. Electroless nickel plating is an process that codeposits a nickelphosphorous alloy without need for an externally applied electrical current. Color can vary from colorless to golden iridescent brown.
Chem corrosion resistant coating part number mil c 5541 nsn 8030014510284. Milc5541 link is to free spec at defense logistics agency, dla. Mil c 5541 link is to free spec at defense logistics agency, dla. The clear alternative to traditional yellow hex films. Mildtl5541 type ii, class 1a and class 3 rohs compliant astm b921 class 1a and class 3 rohs compliant we are an approved supplier for. The product is a dropin replacement for its hexavalent counterparts. I need to know when to use type i and not to use type i finish. Highly reactive materials should not be brought into contact with milc82. This kind of film usually looks brown or gold, but can be colorless at times. Mil dtl 5541 type ii, class 1a and class 3 rohs compliant astm b921 class 1a and class 3 rohs compliant we are an approved supplier for. If you would like to participate, please visit the project page, where you can join the project and see a list of open tasks. The chromate process provides a clear iridescent to slightly golden iridescent film of low contact resistance per milc5541 mildtl5541 and astm b44993. Electrolurgy performs chem film to mildtl5541 for aerospace and general industry in irvine, ca. Electroless nickel plating per milc26074, astm b733, ams 2404.
Mil c 5541f, chemical films, chromate iridite, aluminum chemical film coatings are gelatinous films which provide some sort of a barrier medium to retard corrosion on aluminum surfaces and enhance adhesion of subsequent coatings such as paints and primers. Milc5541 class 3 receives contact resistance testing. This specification covers chemical conversion coatings formed by the reaction. Mildtl5541 chemical conversion coatings on aluminum and aluminum alloys this specification covers chemical conversion coatings formed by the reaction of chemical conversion materials with the surfaces of aluminum and aluminum alloys. Eaton offers a comprehensive range of mil dtl10544 plugs and receptacles in panel mount and cable mount configurations. Class 3 we can process to mildtl 5541 tyii clear chem film, rohs compliant. Aluminum chromate conversion coating advanced plating. The specification is approved for use by all departments.
In addition to the coating or coating thickness see 6. Although prepared specifically for dod applications, the standard is used for many commercial applications as well. Mil dtl5541f 11 july 2006 superseding mil c 5541e 30 november 1990 detail specification chemical conversion coatings on aluminum and aluminum alloys this specification is approved for use by all departments and agencies of the department of defense. The electroless nickel phosphorous content affects the properties of the deposit significantly including hardness, corrosion resistance and magnetism. The specification is approved for use by all departments and agencies of the united states department of defense dod. Class 1a chemical conversion coatings are intended to provide corrosion resistance when left unpainted as well as to improve adhesion of paint finish systems on aluminum and aluminum alloys. Wikiproject military history rated startclass this article is within the scope of the military history wikiproject. Type 1 this includes all coatings that have hexavalent chromium. Coatings shall be continuous free from powdery areas, breaks, scratches, etc. The military specification referred to as mildtl5541, military specification, chemical conversion coatings on aluminum and aluminum alloys covers chemical conversion coatings formed by the reaction of chemical conversion materials with the surfaces of aluminum and aluminum alloys. Mil c 26074c 3 my les5 military specification this specification ie approved for we by all departfmnta and agencie8 of the oapartmmt of defense. To accelerate the curing process, heat may be applied up to but not more than 60c. Aluminum chromate conversion coatings, often referred to as chemical film or under the trade names alodine or irridite, produce a thin coating in the range of 0. Milc5541 chem corrosion resistant coating aerobase.
Is there a white paper or guide out there that when and why type i really needs to be used i have a person at work that thinks that type ii is colorless and is using type. Additional features of these military grade, 10contact solutions include. Aluminum chromate conversion coatings per mil c 5541 mil dtl 5541 and astm b44993 advanced plating technologies no longer offers chromate services. The specification is approved for use by all departments and agencies of the united states department. And tcp is very thin and for that reason nondyeable. Mildtl5541 also has established two types of chem film coating. Milc5541, class i a, 3 mildtl5541 type i, ii class ia, 3 ams 2473 type i, class ia coating yellow in appearance maximum corrosion resistance type i, class 3 coating clear or yellow in appearance type ii, class 3 coating clear rohs compliant conductive coating excellent base or primer for painting. Is there a white paper or guide out there that when and why type i really needs to be used. The current specification 2009 is mildtl5541f, which superseded milc5541e in july 2006. Anochem tcp has a bluebright finish without characteristic iridescent yellow color of chromate conversion coatings commonly referred to as alodine. Ace anodizings expert chromate conversion services are highly automated, which gives us the ability to deliver fast turnarounds that meet your demanding production scheduling needs. Mildtl5541f chemical conversion coatings on aluminum and. Custom formulations baychem is an industry leader in custom formulated surface technology and metal finishing chemical products.