1 Jun Q. We are having issues passing Mil-DTLF, Type II, Class 1A for Aluminum We are unable to reach the hours without failing the. Title: Chemical Conversion Coatings on Aluminum and Aluminum Alloys. Scope: This specification covers chemical conversion coatings formed by the reaction. Chemical Films are also known as chem film, alodine, iridite, chemical conversion coatings, or chromate conversion coatings. We offer Mil-Spec and RoHS.
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RoHS is short for the European Parliament’s directives on Reduction of Hazardous Substances, and refers to the constitution of the parts, not the processes used to manufacture the parts.
Chemical conversion coating Class 1A using Alodine or equivalent? As far as I am concerned, there is no yellow conversion coat yellow chromate if you prefer that is Type II.
Many domestic and non-European customers are requiring RoHS compliance, so it is mil-dyl-5541 that the customer is giving you a hard time — he may not be able to use the parts. What is the difference between these two mil mil-dt-l5541 Although prepared specifically for DoD applications, the standard is used for many commercial applications as well. The military specification referred to as MIL-DTL, “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.
Corrosion prevention Military of the United States standards. This page was last edited on 26 Septemberat This is a requirement due to their use on military aircraft. This has led to progressively greater restrictions, imposed by national and international legislation, related to concerns over health and safety and environmental protection, on the use of these treatments. It has gained world wide use across many fields versus the more verbose ISO equivalent i.
MIL-DTL F CHEMICAL CONVERSION COATINGS ON ALUMINUM
MIL-DTLF – Alodine – Chemical Film – Chem film – MIL-C | Santa Clara Plating
Note that chromate conversion coatings have been used for over 50 mik-dtl-5541 as treatment to coated or as-fabricated surfaces to boost corrosion resistance and provide a good basis for the subsequent application of paint. Mike, Further readings on earlier posts at finishing. However, these treatments use hexavalent chromium chemicals that are extremely toxic. June 16, A.
A former governor of NJ once remarked that ” ‘toxic’ is a matter of statute, not opinion”and I think we can look at the word ‘hazardous’ the same way. We appended your question to a thread which answers it. Processing parts per Type I does put hexavalent chromate on the parts, and they are unlikely to pass a test of their RoHS compliance.
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Type I and II conversion coatings provide corrosion protection on unpainted items, as well as improve adhesion of paint finish systems on aluminum and aluminum alloys. The conversion coatings are intended for use on aluminum and aluminum alloy substrates that are not anodized.
We appended your question to thread where Mil-dtl5-541 Sin Kooi had answered the question: Please let me know. We have parts processed per type I versus required type II. If you have time check out http: When Type I is mentioned, the conversion coat contains Hexavalent Chrome but mul-dtl-5541 may not necessarily be yellow. Or just the chemical solution used in the process?
Difference between MIL-C-5541 Class 1a and MIL-DTL-5541 Type 2 Class 1a
There are clear conversion coatings out there which are Hexavalent chromium based. So it probably isn’t correct to call them Type II The situation is simply that parts processed in Type II solutions do not put hexavalent chromium on the parts, so the parts are very likely mil-xtl-5541 be RoHS complaint.
December 9, A.
The MIL-DTL specification covers chemical conversion coatings that form protective coatings by chemical reaction with aluminum and aluminum alloy; these coatings are categorized by the following types and classes. Retrieved from ” https: The customer is giving us a hard time.
They are designated as a post treatment to ion-vapor deposition IVD aluminum used on many military platforms as a cadmium alternative or galvanic corrosion inhibitor. Languages Deutsch Edit links. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Class 1A is the same for both standards. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
I think the confusion is that there are RoHS compliant trivalent conversion coatings which are yellow through the addition of dye — but they are not compliant with MIL-DTL