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  • MIL-DTL-5541 chemical conversion coating | Eng-Tips
    The latest version of Subject standard defines two types of chemical: Type 1 and Type 2 These types determine if the chemical contains hexavalent chromium The older version of the spec specified only classes of treatments: Class 1A and Class 3, for example, determine the thickness of the
  • GOLD CHEMICAL CONVERSION COATING PER MIL-DTL-5541F TYPE II CLASS 3
    We'd like to keep the Type II as ROHS is a concern but also want Gold for primarily aesthetic reasons My proposed new note is below (Class change is for ESD reasons) FINISH: CHEMICAL CONVERSION COATING PER MIL-DTL-5541F TYPE II CLASS 3 (GOLD) Google searches of web and this site didn't turn up a definative answer
  • Specifying MIL-DTL-5541 chemical conversion coating 1 - Eng-Tips
    The latest version of Subject standard defines two types of chemical: Type 1 and Type 2 These types determine if the chemical contains hexavalent chromium The older version of the spec specified only classes of treatments: Class 1A and Class 3, for example, determine the thickness of the
  • touch up with MIL DTL 5541 class 1A | Eng-Tips
    Is there any reason why we couldn't touch up scratches on a MIL DTL 5541 Class 3 with Class 1A? Either class 3 or 1A properties will suffice I just want to know if there will be some incompatibility issues that could deteriorate the existing class 3 coating
  • Chem film MIL-DTL-5541 MIL-DTL-81706 | Eng-Tips
    I'm having trouble selecting a chem film class I'm designing an avionics box that basically operates in a marine environment and is safety critical equipment Type I is not an option for us (environmental restrictions), so I intended to callout Type II, Class 1A There were concerns with
  • Anodizing MIL-A-8625C vs MIL-A-8625D 1 - Eng-Tips
    Similar threads MIL-DTL-5541, Type II, Class 1A residue mwooz Jan 6, 2026 Metal and Metallurgy engineering Replies 3 Views 272 Jan 8, 2026 mwooz
  • MIL-DTL-5541, Type II, Class 1A residue - Eng-Tips
    We have parts with a whiteish residue and some parts with that reddish residue after being processed per MIL-DTL-5541, Type II, Class 1A Can we use these parts "as is" or is there a risk of corrosion? These defects are at a weld interface gap
  • Anodize Over Chromate? Chromate over Anodize? | Eng-Tips
    Then selectively apply chemical conversion coating (alodine) in accordance with MIL-C-5541, type I, class 3, or a similar commercial process Just be aware that this chem film only provides marginal corrosion protection
  • Chemical conversion coatings pretreatments for aluminum
    Is there a difference between specifying a "5 stage chrome phosphate" pretreatment versus "clear chemical conversion coating per MIL-DTL-5541F Type 2 Class 3 (ROHS compliant)" Is the later just more specific? I guess the question is if I specify the MIL spec am I essentially getting a 5 stage
  • How do you measure and state surface resistances of materials?
    MIL-C-5541 also lists a couple of caveats regarding sufrace roughness and contact flatness effects on the measurement MIL-C-5541 6 1 2 1 discusses the nominal probe pressure and the expected surface resistance for Class 3





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