On December 18, 2018, Xia, Liangwen; Wang, Xianggang; Xia, Yuchun published a patent.COA of Formula: C9H9N3 The title of the patent was Chromium-free passivator and application thereof. And the patent contained the following:
The present invention discloses a chromium-free passivator and application thereof, which has no toxic and side effects on human body and operating environment, and is very suitable for pre-spraying treatment of aluminum profiles. The chromium-free passivator comprises the following components in percentage by weight: hydrofluoric acid 20-40%, nitric acid 20-30%, fluoro zirconic acid 15-25%, sodium nitrate 2-8%, sodium sulfate 3-6%, nitrogen-containing heterocyclic compounds 2-5%, trisodium hydroxyethyl diamine tetraacetate 2-5%, and diethylene glycol Bu ether 3-14%, when using, mixing with running water to form passivation tank liquid The experimental process involved the reaction of 4-(p-Tolyl)-1H-1,2,3-triazole(cas: 5301-96-2).COA of Formula: C9H9N3
The Article related to chromium free passivator passivation tank liquid, Nonferrous Metals and Alloys: Surface Treatment, Metallic and Nonmetallic Coating, Sealing, Cleaning, Polishing, Etching, and Pickling and other aspects.COA of Formula: C9H9N3
Referemce:
1,2,3-Triazole – Wikipedia,
Triazoles – an overview | ScienceDirect Topics