Although mil dtl 5541 has been superseded by more recent specifications, it still remains a specification approved by all agencies and departments in the us department of. Milc5541 mildtl5541 type i yellow type ii clear ams2473 astm b449 7. Iridite, alodine mil c 5541 class 3 mil dtl 5541 type i class 3 ams2474 astm b44993 class 3 7. Mildtl5541 chemical conversion coatings on aluminum and. One side of the part is to be processed per milc5541, class 1a, then primed.
Apr 02, 2009 chemical conversion coating mil dtl 5541 type 2, class 1a hexavalentfree chrome. The mil dtl 5541 specification covers chemical conversion coatings that form protective coatings by chemical reaction with aluminum and aluminum alloy. National stock numbers related to part number milc5541 40 listings nsn submit rfq cage part description. For protection against corrosion where low electrical resistance is required. This was formerly known as milc5541 and is another of our alltime bestselling plating specs. Contact ens technology regarding chromate conversion coating mildtl5541 today. Mil dtl 5541f is a detailed spec for a chemical conversion coating over aluminum.
Milc5541 chem corrosion resistant coating aerobase. Class 1a for maximum protection against corrosion, painted or unpainted class 3 for protection against corrosion where low electrical resistance is required. Henkel bonderite mcr 1201 aero light metals conversion coating. In a type i coating, the chemical composition contains hexavalent chrome. Anochem tcp has a bluebright finish without characteristic iridescent yellow color of chromate conversion coatings commonly referred to as alodine. Chem film per mil dtl 5541 class 3 is electrically conductive. Milc5541 link is to free spec at defense logistics agency, dla. The primary difference between a class 1a and class 3 coating is.
Mildtl5541f chemical conversion coatings on aluminum and. For maximum protection against corrosion, painted or unpainted. Henkel alodine 1200s conversion coating mildtl81706 class. Mildtl5541 is a military specification related to conversion coatings. The test method, frequency of testing, and required resistance values shall be specified by the acquisition activity to meet the needs of a particular application see 6. Mil c 5541 mil dtl 5541 type i yellow type ii clear ams2473 astm b449 7. Class 3 clear or yellow for protection against corrosion where low electrical resistance is required. Iridite chromate conversion coating finish milc5541. Iridite mil c 5541 mil dtl 5541 class 3 ams2474 astm b449 class 3 7. A discussion started in 2004 but continuing through 2017. Provides protection against corrosion where low electrical resistance is.
Mildtl81706 covers the requirements for the chemical materials used in the formation of conversion coatings by the reaction of the material and the surfaces of aluminum and aluminum alloys. Milc5541 class 3 mildtl5541 type i class 3 ams2474 astm b44993 class 3 7. Chemical conversion coating mildtl5541 type 2, class 1a hexavalentfree chrome. In addition to the coating or coating thickness see 6. Chemical film per milc 5541 class 3, gold chemical film per mildtl 5541 class 3, type ii, clear black anodize per mila8625 type ii, class 2 hard black anodize per mila8625 type iii, class 2 electroless nickel per milc26074 class 4, grade b, bright mounting method table method a 1. Class 3 for protection against corrosion where low electrical resistance is required. Mildtl5541f chemical conversion coatings on aluminum. The trivalent chromium process tcp provides a non hexavalent chrome coating compliant with rohs, elv and weee directives. 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. Two classes of coatings are available under milc5541 and milc81706. 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.
As far as i can ascertain, clear coating can only be applied per class 3. Chromate conversion coating capabilities milc5541e. Qpl number 81706 milc5541 document id mildtl81706b, type ii, class 1a, form i, method c document id mildtl81706b, type ii, class 3, form i, method c. These coatings can modify the surface of the aluminum material for improved corrosion resistance, electrical. This specification does list the applicator pen as an option under methods of application. Chemical conversion coatings on aluminum plating per mil dtl 5541 and milc5541 conversion coatings for aluminum meets requirements of military specifications mil dtl 5541 specifications aluminum alloys and coatings benefit from additional protective features of conversion coatings. Henkel alodine 1200s conversion coating mildtl81706. Mil dtl 5541 is a military specification related to conversion coatings.
Henkel alodine is specially formulated to meet 1201 mil. Mildtl81706b 25 october 2004 superseding mildtl81706a 18 february 2002 detail specification chemical conversion materials for coating aluminum and aluminum alloys this specification is approved for use by all departments and agencies of the department of defense. The material and processing baths or solutions shall have no adverse effect on the health of personnel see 6. Aluminum chromate conversion coatings to milc5541 mildtl5541 type i compositions containing hexavalent chromium type ii compositions containing no hexavalent chromium. 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. Aluminum chromate conversion coating advanced plating. I think the right update for milc5541 link is to free spec at defense logistics agency, dla. Electrical contact resistance testing shall be as specified in the contract or order see 6. Govt designation a government designation is the name or number as assigned in the governing specification document. Aluminum chromate conversion coatings per milc5541 mildtl5541 and. We have it available in onequart, onegallon and 55gallon containers to suit your needs. Class 1a is for maximum corrosion protection, class 3 is for corrosion protection where low electrical resistance is required. Chem film per mildtl5541 class 3 is electrically conductive. We also offer the more traditional process for gold and yellow mildtl5541f class 1a requirements.
Addresses compositions containing hexavalent chromium. We also offer the more traditional process for gold and yellow mil dtl 5541f class 1a requirements. Difference between milc5541e, amsc5541, and mildtl. Iridite, alodine milc5541 class 3 mil dtl 5541 type i class 3 ams2474 astm b44993 class 3 7. Class 3 coatings are qualified per milc81706 to have a resistance no greater than 5,000 microhms per square inch as supplied and 10,000 microhms per square inch after 168 hours of salt spray exposure. The specification is approved for use by all departments and agencies of the united states department of defense dod.
Chemical conversion coating mildtl5541 type 2, class 1a. The current specification 2009 is mildtl5541f, which superseded milc5541e in july 2006. The current specification 2009 is mil dtl 5541f, which superseded mil c5541e in july 2006. Qpl number 81706 mil c 5541 document id mil dtl 81706b, type ii, class 1a, form i, method c document id mil dtl 81706b, type ii, class 3, form i, method c. The best corrosion protection is provided by chem film per mildtl5541 class 1a. Coatings shall be continuous free from powdery areas, breaks, scratches, etc. Even after 168 hours of salt spray testing, class 3 coatings must exhibit electrical resistance at no greater than 10,000 microhms per square inch. I think the right update for mil c 5541 link is to free spec at defense logistics agency, dla. This specification is approved for use by all departments and agencies of the department of defense.
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. Mil mil dtl 5541f chemical conversion coatings on aluminum and aluminum alloys superseding mil c 5541e standard by military specifications and standards, 07112006 amendments available. Contact ens technology regarding chromate conversion coating mil dtl 5541 today. Mildtl5541 chemical conversion coatings on aluminum. The specification is approved for use by all departments and agencies of the united states department. Class 3 chemical conversion coatings are intended for use as a corrosion preventive film for electrical and electronic applications where lower resistant contacts, relative to class 1a coatings, and anodic coatings in accordance with mil a8625, are required see 6. Although the iridescent gold finish is very attractive, it is not as durable as an anodized finish. Henkel bonderite aero chromate coating mcr 1201 skygeek. 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.
The best corrosion protection is provided by chem film permildtl5541 class 1a. Mil c 5541 mil dtl 5541 type i yellow type ii clear. The best corrosion protection is provided by chem film per mil dtl 5541 class 1a. Mildtl5541 chemical conversion coatings on aluminum and aluminum alloys this specification covers chemical conversion coatings. What ams spec is equivalent to milc5541 type 1 grade c, class 3. Available masking for selective surface chem filming salt spray corrosion test. As established by mil dtl 5541, both class 1a and class 3 refer to coatings that offer increased corrosion resistance and adhesive properties. The specification is approved for use by all departments. 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. Class 3 however, also maintains electrical conductivity. Mildtl81706 milc5541 class 3 rohs thermalloy milc5541 astm b 117. Mildtl5541f is a detailed spec for a chemical conversion coating over aluminum. Available masking for selective surface chem filming salt spray corrosion test minimum 168 hours of salt spray resistance.
Surtec 650 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. Touchnprep alodine pen implementation at boeing st. Class 3 clear finish what is the difference between gold iridite and clear iridite in terms of process. This film typically appears to be gold or brown in color, but in some cases. We offer an rohscompliant clear trivalent chromium process that is free from hexavalent chromium and complies with the requirements of mil dtl 5541f class 3. Typical contact resistance of class 3 aluminum chromate conversion coatings. This is created through the chemical conversion substance reaction with aluminum and its alloys. Milc5541 mildtl5541 show complete document history. The format and any coded meanings to the designation are identified and explained in the specification. Chem processing offers both trivalent rohs compliant and hexavalent chromium based chem film. Mil dtl 81706 covers the requirements for the chemical materials used in the formation of conversion coatings by the reaction of the material and the surfaces of aluminum and aluminum alloys. Although mildtl5541 has been superseded by more recent specifications, it still remains a specification approved by all agencies and departments in the us department of. Chem corrosion resistant coating part number milc5541 nsn 8030014510284. 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.
Gold chemical conversion coating per mildtl5541f type ii class 3 gold chemical conversion coating per mildtl5541f type ii class 3 kenat mechanical op 12 aug 08 20. Difference between milc5541e, amsc5541, and mildtl541f. We offer an rohscompliant clear trivalent chromium process that is free from hexavalent chromium and complies with the requirements of mildtl5541f class 3. Chem film per mildtl 5541 class 3 is electrically conductive. Iridite milc5541 mildtl5541 class 3 ams2474 astm b449 class 3 7. In that case, class 3, is for protection against corrosion where low electrical resistance is required and you would spec type i for compositions. Two classes of coatings are available under mil c 5541 and mil c 81706. Mil mildtl5541f chemical conversion coatings on aluminum and aluminum alloys superseding milc5541e standard by military specifications and standards, 07112006 amendments available. Aluminum chromate conversion coatings, often referred to as chemical film or. The military specification referred to as mildtl5541, military specification, chemical. Although prepared specifically for dod applications, the standard is used for many commercial applications as well.
This film typically appears to be gold or brown in color, but in. As established by mildtl5541, both class 1a and class 3 refer to coatings that offer increased corrosion resistance and adhesive properties. Color can vary from colorless to golden iridescent brown. Mil dtl 81706 mil c 5541 class 3 rohs thermalloy mil c 5541 astm b 117 citizen aavid thermalloy c 554 aavid catalog text.
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