Distortion during chemical finishing Distortion during chemical finishing JulieEverett (Aerospace) (OP) 13 Mar 15 09:39 Hi - can anyone advise if 0.5mm thick aluminium tooling plate might distort during alochrome? RE: Distortion during chemical finishing IRstuff (Aerospace) 13 Mar 15 13:16 I would think it could be easily distorted. But, this usually points to an issue with the alochrome; hard metal coatings tend to be high stress, so stress relief through annealing and process control is important, particularly the latter. There are process changes that can result in lower stress, but there may be density or hardness compromises. TTFN FAQ731-376: Eng-Tips.com Forum Policies Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers Of course I can. I can do anything. I can do absolutely anything. I'm an expert! There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx RE: Distortion during chemical finishing tbuelna (Aerospace) 14 Mar 15 23:11 Isn't alochrome a conversion coating similar to alodine? I don't think a process like alodine will cause any distortion of a thin aluminum sheet metal component. By the way, flat .5mm thick aluminum stock is usually referred to as "sheet" rather than "plate".