To maintain compliance with mildtl5541f, applicators must test samples on. The military specification referred to as mildtl 5541, 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. Chemical conversion coatings on aluminum plating per mil dtl 5541 and milc 5541 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. This was formerly known as milc 5541 and is another of our alltime bestselling plating specs.
Henkel alodine 1200s conversion coating mildtl81706 class. This family of compounds is formulated to provide a conversion coating on aluminum that will meet a military specification, mil dtl 5541f, which describes chemical conversion coatings on aluminum and aluminum alloys, and mil dtl 81706 that describes the processes certified for use. 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. 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. Mildtl5541 chemical conversion coatings on aluminum and. Wikiproject military history rated start class this article is within the scope of the military history wikiproject. Mil c5541e, mil dtl 5541f, astm b 44993 2004, ams 2473g, ams 2474d and mil dtl. Class 3 however, also maintains electrical conductivity. Qpl number 81706 milc 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.
Because class 3 coatings are thinner they are more susceptible to corrosion than class 1a coatings. Class 1a coatings give maximum corrosion protection with the highest electrical surface resistance while class 3 coatings have lower corrosion. The name, alodine is a registered trade name of henkel surface technologies. The military specification referred to as mil dtl 5541, 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. For protection against corrosion where low electrical resistance is required. 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 specification is approved for use by all departments and agencies of the united states department.
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. Chemical conversion coating mildtl5541 aluminum coatings. Contact ens technology regarding chromate conversion coating mil dtl 5541 today. This is created through the chemical conversion substance reaction with aluminum and its alloys. Chemical conversion coating mildtl5541 type 2, class 1a hexavalent free chrome. Trivalent chromate, however, is only offered in clear. Mil c 5541 link is to free spec at defense logistics agency, dla. Mildtl 5541 is a military specification related to conversion coatings. There are definitely a couple of tricks to passing mil dtl 5541f, type ii, class 1a for al 2024, and they apply to type i, also. 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 military specification referred to as mildtl5541, military specification, chemical. Mil c 5541 does not provide any plating procedures that assure a class 1a or class 3 coating. Aluminum chromate conversion coatings per milc5541 mildtl5541 and.
The material and processing baths or solutions shall have no adverse effect on the health of personnel see 6. Fsc standardization area mffp metal finishes and finishing processes and procedures this document comes with our free notification service, good for the life of the document. Department of defense was the first to use tcphf trivalent chromium, hexfree and this trivalent chromate conversion coating has become such an accepted standard that a detailed specification, mil dtl 5541, included it. Difference between milc5541e, amsc5541, and mildtl541f. Pdf milc 5541 finishes mil dtl 81706 milc 5541 class 3 rohs thermalloy astm b 117 citizen aavid thermalloy c554 aavid catalog. The current specification 2009 is mil dtl 5541f, which superseded mil c5541e in july 2006. Mildtl 5541 chemical conversion coatings on aluminum and aluminum alloys. We also offer the more traditional process for gold and yellow mil dtl 5541f class 1a requirements. What ams spec is equivalent to milc5541 type 1 grade c, class 3. Although the iridescent gold finish is very attractive, it is not as durable as an anodized finish. A discussion started in 2000 but continuing through 2019.
Difference between milc5541e, amsc5541, and mildtl. Nov 29, 2014 the current specification 2009 is mil dtl 5541f, which superseded mil c 5541e in july 2006. Part number mil c 5541 including related part numbers and nsn starting at page 1. 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. A national stock number nsn is a thirteen digit number uniquely identifying a single government part designation. Mil dtl 5541 chemical conversion coatings on aluminum and. Google searches of web and this site didnt turn up a definative answer. Both processes have been qualified per mil dtl 81706, periodic testing is carried out per the requirements of mil dtl 5541f for class 1a and class 3 consisting of a 5% neutral salt spray test at 168 hours, paint adhesion, low electrical resistance checked 6 monthly and coating weight validation maintaining a repeatable process. Electrical contact resistance testing shall be as specified in the contract or order see 6. Mil mildtl5541f chemical conversion coatings on aluminum and aluminum alloys superseding mil c5541e standard by military specifications and standards, 07112006 amendments available view all product details. There are two types of coating as specified in mil dtl 81706b and mil dtl 5541f.
To find similar documents by federal supply class code. 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. As far as i can ascertain, clear coating can only be applied per class 3. Although mildtl 5541 has been superseded by more recent specifications, it still remains a specification approved by all agencies and departments in the us department of. Class 3 for protection against corrosion where low electrical resistance is required. Milc 5541 class 3 versus mil a8625 type iii class 2 2006. As established by mil dtl 5541, both class 1a and class 3 refer to coatings that offer increased corrosion resistance and adhesive properties. Milc5541e, mildtl5541f, astm b 44993 2004, ams 2473g, ams 2474d and mildtl. Typical contact resistance of class 3 aluminum chromate conversion coatings. Milc 5541 link is to free spec at defense logistics agency, dla. Mil dtl 81706 milc 5541 class 3 rohs thermalloy milc 5541 astm b 117 citizen aavid thermalloy c554 aavid catalog text. The current specification 2009 is mil dtl 5541f, which. Iridite chromate conversion coating finish milc5541.
I need to determine the difference between a reference to milc 5541 e and mil dtl 5541 link is to free spec at defense logistics agency, dla. Instead, the spec pr electrical surface resistance test just for the class 3 coating and a 168 hour salt spray test that applies to both clas class 3 coatings equally, using a 5% salt solution. Mildtl5541 chemical conversion coatings on aluminum. If you would like to participate, please visit the project page, where you can join the project and. Gold chemical conversion coating per mil dtl 5541f type ii class 3 gold chemical conversion coating per mil dtl 5541f type ii class 3 kenat mechanical op 12 aug 08 20. Mildtl5541f chemical conversion coatings on aluminum and. Aluminum chromate conversion coatings to milc5541 mildtl5541 type i compositions containing hexavalent chromium type ii compositions containing no hexavalent chromium. Mil dtl 81706a 18 february 2002 superseding mil c81706 30 june 1970 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. Often, sodium metasilicate is used as a builder for lightmetal cleaners. Military specification mildtl5541 chemical conversion coatings.
In addition to the coating or coating thickness see 6. Milc 5541 does not provide any plating procedures that assure a class 1a or class 3 coating. Milc5541 link is to free spec at defense logistics agency, dla. Two classes of coatings are available under milc 5541 and mil c81706. The situation is that you cant comply with mildtl5541 without processing per its. Provides protection against corrosion where low electrical resistance is required. This specification is approved for use by all departments and agencies of the department of defense.
My company has been doing class 3 conversion coatings per milc 5541 link is to free spec at defense logistics agency, dla. In a type i coating, the chemical composition contains hexavalent chrome. Provides protection against corrosion where low electrical resistance is. Chemical conversion coating mildtl5541 type 2, class 1a. This document is available in either paper or pdf format. Chromate conversion coating capabilities milc5541e. A discussion started in 2004 but continuing through 2017.
An nsn, although displayed or written as a continuous string of digits, consists of two separate components the fsc and niin. How to pass mildtl5541f for aluminum products finishing. Pdf a2804 milc 5541 mil dtl 5541 mil a8625 mil c26074 calmark. Mildtl5541f chemical conversion coatings on aluminum. Class 3 clear finish what is the difference between gold iridite and clear iridite in terms of process. First, we highly recommend using an allpurpose, nonetch lightmetal cleaner.
Milc26074 e electroless nickel plating fed qqn290a. These coatings can modify the surface of the aluminum material for improved corrosion resistance, electrical. It has gained worldwide use across many fields versus the more verbose iso. Nov 14, 2016 mil dtl 5541 is a military specification related to conversion coatings. My proposed new note is below class change is for esd reasons. Adhesion improves paint and epoxy adhesion, corrosion protection withstands 48 hours of corrosion resistance per mil c 5541 and mil dtl. 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. If it is required to paint areas surrounding electrical class 3 coatings improve.
Sponsored links speed downloads mil c 5541 trusted download 1500 kbs 10 310 mil c 5541 highspeed download 1200 kbs 5 945 mil c 5541 full download kbs 1 290 68 p misc accy mil a8625, type ii, class 2. What is alodine chem film chromate conversion coating. Although prepared specifically for dod applications, the standard is used for many commercial applications as well. Anodising, hard anodising, alodine chemical conversion. The trivalent chromium process tcp provides a non hexavalent chrome coating compliant with rohs, elv and weee directives. This was formerly known as mil c 5541 and is another of our alltime bestselling plating specs. 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. Aluminum chromate conversion coatings, often referred to as chemical film or. This is a visible coating that leaves the surface with a golden coloration. Henkel alodine 12 touchnprep chromate conversion coating. A spec or slash sheet identifies a specific piece or section of a general specification or standard.
The specification is approved for use by all departments and agencies of the united states department of defense dod. The current specification 2009 is mil dtl 5541f, which superseded mil c 5541e in july 2006. That certification recently changed to mil dtl 5541 f. Class 1a for maximum protection against corrosion, painted or unpainted class 3 for protection against corrosion where low electrical resistance is required. Apr 02, 2009 entire process of rohscompliant chemical conversion process. I agree, ted the biggest difference between milc5541e and mildtl5541f is that the. 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. Class 1a coatings give maximum corrosion protection with the highest electrical surface resistance while class 3 coatings have lower corrosion protection and provide lower electrical surface resistance. Aluminum chromate conversion coatings to milc 5541 mil dtl 5541 type i compositions containing hexavalent chromium type ii compositions containing no hexavalent chromium. Class 1a maximum corrosion protection, painted or unpainted and class 3. Greetings, i am engineering student, i am designing a radiator of aluminum and wanted to consult as anticorrosive treatment but is adapted, milc 5541 class 3 versus mil a8625 link is to free spec at defense logistics agency, dla. Aluminum chromate conversion coating advanced plating. Mil dtl 81706b, type i, class 3, form ii, method c. This film typically appears to be gold or brown in color, but in some cases.
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