![]() ![]() Article Category related to subsequent service life (AC): N/A.Product category (PC): 14- Metal surface treatment products.Environmental release category (ERC): 5.Sector of end use (SU): Other: Aerospace and defence industry and its supply chains.This “applied for use” involves the continued use of Chromium trioxide, Sodium dichromate, Potassium dichromate and Dichromium tris(chromate) across approximately 80 sites across Great Britain (GB). Due to the complexity of design challenges, performance requirements, safety requirements and regulatory controls that must be tested for each listed alternative, and the need for industrial implementation in the whole supply chain, the applicant is seeking a review period of 12 years. The applicants have identified a shortlist of potentially suitable alternatives. Impact on fatigue life is also considered when assessing test candidates for Cr(VI) for conversion coating, as well as pre-treatment compatibility and the ability to visually determine that the conversion coating has been appropriately and uniformly applied (inspectability).īrenntag UK Ltd are seeking authorisation for chemical conversion coating using sodium dichromate and potassium dichromate, whilst Wesco Aircraft EMEA Ltd are seeking an authorisation for chemical conversion coating using chromium trioxide and dichromium tris(chromate). These functions are relevant to all four chromates, and their use across all application methods, e.g., immersion versus brush/swab and touch-up. The key functions of the four chromates in CCC include: Corrosion resistance including active corrosion inhibition ("self-healing"), chemical resistance, adhesion promotion, temperature resistance, layer thickness, and electrical resistivity. The coatings are typically in the lower thickness range (below 0.5 μm). Typical thickness of the coatings is 0.05-2.00 μm. In general, conversion coating forms an adherent, fixed, insoluble, inorganic crystalline or amorphous surface film of complexes from oxides and hydroxides and chromium trioxide as an integral part of the metal surface by means of a chemical reaction between the metal surface and the immersion solution. We define conversion coating as “a chemical process that introduces a chemical coating or changes the surface of the substrate to improve the substrate properties (e.g., corrosion resistance or to promote adhesion of subsequent coatings).” Note that the conversion coating layer itself is not corrosion resistant, but it provides improved corrosion resistance to the substrate. Conversion coating removes the native oxide and replaces it with an oxide that has predictable and stable properties, formed from the substrate metal and the processing solution. The term “chemical conversion coating” is used for both the process and the resulting coating layer. Proposed use: Chemical conversion coating using chromium trioxide, sodium dichromate, potassium dichromate, and/or dichromium(tris) chromate in aerospace and defence industry and its supply chains.īroad information on use applied for (conditions of use and function):Ĭhemical conversion coating (CCC) is a chemical process applied to a substrate producing a superficial layer containing a compound of the substrate metal and elements from the processing solution. Henkel Global Supply Chain B.V.Overview Public consultation on alternativesĬhromium trioxide (includes “Acids generated from chromium trioxide and their oligomers", when used in aqueous solutions) (CT) Surface treatment of metals (such as aluminium, steel, zinc, magnesium, titanium, alloys), composites and sealings of anodic films for the aerospace sector in surface treatment processes in which any of the key functionalities listed in the Annex is required Henkel Global Supply Chain B.V., Gustav Mahlerlaan 2970, 1081 LA Amsterdam, Netherlands In accordance with Article 60(4) of Regulation (EC) No 1907/2006, the socioeconomic benefits outweigh the risk to human health from the uses of the substance and there are no suitable alternative substances or technologies. KGaA, Henkelstrasse 67, 40191 Düsseldorf, North-Rhine Westfalia, Germanyįormulation of mixtures intended exclusively for uses REACH/20/1/2 and REACH/20/1/3) (Published pursuant to Article 64(9) of Regulation (EC) No 1907/2006 ( 1) ) Summary of European Commission Decisions on authorisations for the placing on the market for the use and/or for use of substances listed in Annex XIV to Regulation (EC) No 1907/2006 of the European Parliament and of the Council concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) ![]()
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