пассивациятрубопровода(Passivation is a chemical treatment process where the stainless steel is treated with an oxidizing acid. Passivation dissolves carbon steel, and sulfide inclusions and removes iron and other surface contaminants from the stainless steel surface. At the same time, the acid promotes a chromium-rich thin but dense passive film (oxide protective layer) formation. This passive film imparts the corrosion resistance quality. Passivation of stainless steel is performed using nitric acid. Similar to pickled steel, passivated steel does not affect the metal’s appearance.Bauirjan)
пассивация(поверхностная обработка кристалла для защиты от влажности и загрязнений, например путём нанесения на его поверхность слоя двуокиси кремния, нитрида кремния, стекла и др.)
