Chem processing offers both trivalent rohs compliant and hexavalent chromium based chem film. In addition to the coating or coating thickness see 6. 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. 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. Two classes of coatings are available under mil c 5541 and mil c 81706.
Milc5541 class 3 mildtl5541 type i class 3 ams2474 astm b44993 class 3 7. These coatings can modify the surface of the aluminum material for improved corrosion resistance, electrical. The material and processing baths or solutions shall have no adverse effect on the health of personnel see 6. Mildtl5541f chemical conversion coatings on aluminum. National stock numbers related to part number milc5541 40 listings nsn submit rfq cage part description. 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. Iridite chromate conversion coating finish milc5541. In a type i coating, the chemical composition contains hexavalent chrome. For protection against corrosion where low electrical resistance is required. The mil dtl 5541 specification covers chemical conversion coatings that form protective coatings by chemical reaction with aluminum and aluminum alloy.
Chromate conversion coating capabilities milc5541e. The primary difference between a class 1a and class 3 coating is. A discussion started in 2004 but continuing through 2017. Mil dtl 5541f is a detailed spec for a chemical conversion coating over aluminum. Mildtl5541 chemical conversion coatings on aluminum and. As far as i can ascertain, clear coating can only be applied per class 3. 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. Mildtl5541 is a military specification related to conversion coatings. We also offer the more traditional process for gold and yellow mildtl5541f class 1a requirements.
The current specification 2009 is mil dtl 5541f, which superseded mil c 5541e in july 2006. The trivalent chromium process tcp provides a non hexavalent chrome coating compliant with rohs, elv and weee directives. Iridite, alodine milc5541 class 3 mil dtl 5541 type i class 3 ams2474 astm b44993 class 3 7. Milc5541 link is to free spec at defense logistics agency, dla. Henkel bonderite mcr 1201 aero light metals conversion coating. Henkel alodine is specially formulated to meet 1201 mil. The best corrosion protection is provided by chem film per mil dtl 5541 class 1a. Difference between milc5541e, amsc5541, and mildtl. 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.
We also offer the more traditional process for gold and yellow mil dtl 5541f class 1a requirements. Electrical contact resistance testing shall be as specified in the contract or order see 6. Contact ens technology regarding chromate conversion coating mil dtl 5541 today. Class 3 clear or yellow for protection against corrosion where low electrical resistance is required. Chemical conversion coating mildtl5541 type 2, class 1a hexavalentfree chrome. Addresses compositions containing hexavalent chromium. This film typically appears to be gold or brown in color, but in some cases. 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. The current specification 2009 is mil dtl 5541f, which superseded mil c5541e in july 2006.
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. This film typically appears to be gold or brown in color, but in. I think the right update for mil c 5541 link is to free spec at defense logistics agency, dla. Henkel alodine 1200s conversion coating mildtl81706. 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.
The specification is approved for use by all departments and agencies of the united states department. Class 3 however, also maintains electrical conductivity. Henkel bonderite aero chromate coating mcr 1201 skygeek. I think the right update for milc5541 link is to free spec at defense logistics agency, dla. Two classes of coatings are available under milc5541 and milc81706. 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. Class 1a for maximum protection against corrosion, painted or unpainted class 3 for protection against corrosion where low electrical resistance is required. Class 3 clear finish what is the difference between gold iridite and clear iridite in terms of process. Mildtl5541 chemical conversion coatings on aluminum. The current specification 2009 is mildtl5541f, which superseded milc5541e in july 2006. This was formerly known as milc5541 and is another of our alltime bestselling plating specs.
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. One side of the part is to be processed per milc5541, class 1a, then primed. 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. Apr 02, 2009 chemical conversion coating mil dtl 5541 type 2, class 1a hexavalentfree chrome. Mil dtl 5541 is a military specification related to conversion coatings. Iridite, alodine mil c 5541 class 3 mil dtl 5541 type i class 3 ams2474 astm b44993 class 3 7. 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. We offer an rohscompliant clear trivalent chromium process that is free from hexavalent chromium and complies with the requirements of mildtl5541f class 3.
Mil dtl 81706 mil c 5541 class 3 rohs thermalloy mil c 5541 astm b 117 citizen aavid thermalloy c 554 aavid catalog text. Milc5541 mildtl5541 show complete document history. Anochem tcp has a bluebright finish without characteristic iridescent yellow color of chromate conversion coatings commonly referred to as alodine. This is created through the chemical conversion substance reaction with aluminum and its alloys. Mildtl5541 chemical conversion coatings on aluminum and aluminum alloys this specification covers chemical conversion coatings. The best corrosion protection is provided by chem film permildtl5541 class 1a. 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. For maximum protection against corrosion, painted or unpainted. Milc5541 mildtl5541 type i yellow type ii clear ams2473 astm b449 7. Touchnprep alodine pen implementation at boeing st.
Mil c 5541 mil dtl 5541 type i yellow type ii clear. 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. The format and any coded meanings to the designation are identified and explained in the specification. Chem film per mildtl 5541 class 3 is electrically conductive. Available masking for selective surface chem filming salt spray corrosion test. We have it available in onequart, onegallon and 55gallon containers to suit your needs. Nov 29, 2014 the current specification 2009 is mil dtl 5541f, which superseded mil c 5541e in july 2006.
Available masking for selective surface chem filming salt spray corrosion test minimum 168 hours of salt spray resistance. A discussion started in 2000 but continuing through 2019. 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 specification is approved for use by all departments. Coatings shall be continuous free from powdery areas, breaks, scratches, etc. Provides protection against corrosion where low electrical resistance is. In that case, class 3, is for protection against corrosion where low electrical resistance is required and you would spec type i for compositions. Iridite mil c 5541 mil dtl 5541 class 3 ams2474 astm b449 class 3 7. Although the iridescent gold finish is very attractive, it is not as durable as an anodized finish. Nsn a national stock number nsn is a thirteen digit number uniquely identifying a single government part designation. Mil mildtl5541f chemical conversion coatings on aluminum and aluminum alloys superseding milc5541e standard by military specifications and standards, 07112006 amendments available. Mil c 5541 mil dtl 5541 type i yellow type ii clear ams2473 astm b449 7. 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.
Color can vary from colorless to golden iridescent brown. As established by mildtl5541, both class 1a and class 3 refer to coatings that offer increased corrosion resistance and adhesive properties. 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. Aluminum chromate conversion coating advanced plating. 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. Typical contact resistance of class 3 aluminum chromate conversion coatings. Mildtl5541 chemical conversion coatings on aluminum and aluminum alloys. Milc5541 chem corrosion resistant coating aerobase. The specification is approved for use by all departments and agencies of the united states department of defense dod. 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. 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.
The best corrosion protection is provided by chem film per mildtl5541 class 1a. Iridite milc5541 mildtl5541 class 3 ams2474 astm b449 class 3 7. 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. Aluminum chromate conversion coatings to milc5541 mildtl5541 type i compositions containing hexavalent chromium type ii compositions containing no hexavalent chromium. Class 3 for protection against corrosion where low electrical resistance is required. Henkel alodine 1200s conversion coating mildtl81706 class. 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. The situation is that you cant comply with mildtl5541 without processing per its. 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. Chem film per mil dtl 5541 class 3 is electrically conductive. The military specification referred to as mildtl5541, military specification, chemical. This specification is approved for use by all departments and agencies of the department of defense. Mildtl81706 milc5541 class 3 rohs thermalloy milc5541 astm b 117.
What ams spec is equivalent to milc5541 type 1 grade c, class 3. Although prepared specifically for dod applications, the standard is used for many commercial applications as well. Mildtl5541f is a detailed spec for a chemical conversion coating over aluminum. Chemical conversion coating mildtl5541 type 2, class 1a. Contact ens technology regarding chromate conversion coating mildtl5541 today. Chem film per mildtl5541 class 3 is electrically conductive. Aluminum chromate conversion coatings, often referred to as chemical film or. Chem corrosion resistant coating part number milc5541 nsn 8030014510284.
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