Pickling solution capable of removing hot-rolled corrosion-resisting alloy oxide skin and pickling method thereof

Abstract

The invention relates to a pickling solution capable of removing hot-rolled corrosion-resisting alloy oxide skin and a pickling method thereof. The pickling solution comprises 10 g / L-60 g / L of sulfuric acid, 90 g / L-120 g / L of hydrochloric acid, 25 g / L-75 g / L of nitric acid and the balance of water by proportioning. The pickling method comprises the following steps of: I. soaking corrosion-resisting alloy which is annealed and is subjected to shot blasting in the pickling solution capable of removing the hot-rolled corrosion-resisting alloy oxide skin and comprising 10 g / L-60 g / L of sulfuric acid, 90 g / L-120 g / L of hydrochloric acid, 25 g / L-75 g / L of nitric acid and the balance of water by proportioning, wherein the soaking temperature is 20-90 DEG C, and the soaking time is 120-1 minute; and II. cleaning the pickled corrosion-resisting alloy by using a nylon brush or a roll brush, and then washing and airing. The pickling solution reduces environmental pollution caused by hydrofluoric acid; and due to application of the pickling method, local corrosion is not easy to generate on the surface of a pickled surface.

Description

technical field [0001] The invention relates to a pickling solution for removing scales of hot-rolled corrosion-resistant alloys and a pickling method thereof, in particular to pickling solutions for hot-rolled duplex stainless steel, super austenitic stainless steel and iron-nickel-based corrosion-resistant alloy scales and its pickling method. Background technique With the continuous development of industry, the demand for corrosion-resistant alloys continues to rise, and the output of corrosion-resistant alloys produced by steel mills increases year by year. In order to adapt to more severe corrosive environments, the content and types of elements in alloys are gradually increased, such as duplex stainless steel S32205, S32750, super austenitic stainless steel N08904, N08028, etc. During the hot rolling and annealing process of these alloys, the surface will be covered with a layer of Fe with a dense structure, which is firmly combined with the matrix. 2 o 3 , Fe ...

AI Technical Summary

Problems solved by technology

The applicant is currently using type (3), wherein the single acid is H 2 SO 4 , the mixed acid is HNO 3 +HF, using this process to pickle ordinary austenite and ferrite can reach the production capacity of the equipment, but when producing corrosion-resistant alloys with high alloy content, even if the concentration of the acid solution is increased, the line speed is very slow. Seriously affect the efficiency of production and reduce the production capacity of equipment