Anti-corrosion alloy and descaling method for derivatives of anti-corrosion alloy

Abstract

The invention discloses an anti-corrosion alloy and a descaling method for derivatives of the anti-corrosion alloy. The method comprises the following steps of S1, pretreatment: removing impurities on the surfaces of the corrosion-resistant alloy and the derivatives thereof; S2, oxide skin crushing: crushing oxide skin on the surfaces of the corrosion-resistant alloy and the derivatives of the corrosion-resistant alloy in a physical mode; S3, surface cleaning: removing the impurities on the surfaces of the corrosion-resistant alloy and the derivatives of the corrosion-resistant alloy treated in the step S2; and S4, local electrolysis descaling: conducting electrolysis descaling on the surfaces, needing descaling, of the corrosion-resistant alloy and the derivatives of the corrosion-resistant alloy by adopting a local electrolysis device. According to the descaling method for the corrosion-resistant alloy and the derivatives thereof, on the premise that the performance of the corrosion-resistant alloy and the derivatives thereof is not affected, oxide skin on the surfaces of the corrosion-resistant alloy and the derivatives thereof and a chromium-poor layer below the oxide skin can be rapidly and efficiently cleaned, so that the surface quality of the corrosion-resistant alloy and the derivatives thereof is better, and the consumption cost in the cleaning process is lower.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a method for descaling corrosion-resistant alloys and derivatives thereof. Background technique [0002] Corrosion-resistant alloys refer to a class of alloys that have more excellent corrosion resistance than ordinary steel materials, including iron-based corrosion-resistant alloys, such as stainless steel; nickel-based corrosion-resistant alloys, such as Ni-Cr alloys, Ni-Cr-Mo alloys , Ni-Cu alloy, etc.; with the wide application of corrosion-resistant alloys in civil and industrial fields, some derivatives based on corrosion-resistant alloys have gradually emerged, such as composite materials combined with corrosion-resistant alloys and ordinary carbon steel , the material has both the cheap and high strength of ordinary carbon steel and the corrosion resistance of corrosion-resistant alloys; since the surface of corrosion-resistant alloys and their derivatives will form...

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Problems solved by technology

Pure corrosion-resistant alloy materials usually use mixed acid pickling or neutral salt electrolytic pickling to remove surface oxide scale; however, mixed acid pickling usually involves the use of volatile acids such as hydrochloric acid, nitric acid, and hydrofluoric acid; Pickling will produce a large amount of chromium-containing wastewater, which will have a serious impact on the surrounding environment; and the cleaning of the oxide skin on the surface of corrosion-resistant alloy derivatives represented by composite plates is more complicated, because it combines the characteristics of two different materials At the same time, it also inherits the characteristics of the oxide scale on the surface of different materials. The difficulty of cleaning the scale of the aforementioned medium corrosion-resistant alloy is much greater than that of ordinary carbon steel. Effect; if the traditional mechanical grinding method is used to treat the corrosion-resistant alloy composite plate, it will easily lead to the thinning of the corrosion-resistant coating, or even wear through the coating, resulting in the exposure of the non-corrosion-resistant carbon steel inside, resulting in waste products; high-pressure water impact, It is difficult to remove the chromium-poor area under the oxide scale of the corrosion-resistant alloy composite plate when cleaning by jet impact containing solid particles; when using a local electrolytic descaling device, the oxide scale on the surface of the corrosion-resistant alloy coating is often dense and has poor conductivity, making it difficult to Removal and descaling are often inefficient and difficult to meet mass production requirements

Due to the above situation, only original and inefficient surface treatment methods such as original milling machine or abrasive belt grinding can be used in actual production, which seriously affects the descaling efficiency and limits the production efficiency and cost of products; if the corrosion-resistant coating is thin, It is also easy to break through the corrosion-resistant cladding and expose the carbon steel layer, which must be manually repaired; thus resulting in extremely low operating efficiency and high cost

Moreover, it is very difficult to control the amount of grinding in the process. If the amount of grinding is too small, the scale will not be removed cleanly. If the amount of grinding is too large, the corrosion-resistant coating will be perforated, resulting in a high scrap rate.

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