Industrial pickling assistant and application thereof

Abstract

The invention discloses an industrial pickling assistant and application thereof. The industrial pickling assistant is prepared from polyaspartic acid, polyoxyethylene ether surfactant, a complexing agent and water in a mixing manner; and the industrial pickling assistant and 18-25wt% of industrial sulfuric acid or hydrochloric acid are mixed to prepare into a cleaning solution according to the weight ratio of 1 to (100-150). The product disclosed by the invention utilizes the collaborative adsorption effect of polyaspartic acid and polyoxyethylene ether surfactant; a stable absorption layer can be stably formed at the surface of metallic matrix, so as to achieve the corrosion-inhibition and anti-rusting effects; the binding force of a rusting layer, a dirt layer and metallic matrix is reduced by utilizing permeating and wetting action of the surfactant; rapid dropping is facilitated; the metal complex ion is formed by the complex agent and Fe, Ca and Mg; free metal ions are reduced to achieve the target of facilitating dissolving of rusting of a steel product or material surface; the components are low in toxicity and biodegradable; and no adverse environmental consequences are generated after the industrial pickling assistant is used.

Description

technical field [0001] The invention belongs to the technical fields of surface treatment, environmental chemical industry, material protection, etc., and specifically relates to an industrial pickling auxiliary agent and its application. Background technique [0002] Iron and steel materials are the most commonly used materials in industrial production and social life, but due to their high chemical activity, surface corrosion often occurs during production, transportation and storage, and the structure of the rust layer is loose, which cannot prevent oxygen in the air from Internal penetration, on the contrary, due to the greater moisture absorption, the internal material will be further corroded. In order to achieve anti-corrosion and decoration on the surface of steel products and materials, the surface rust layer must be cleaned to obtain a relatively clean surface for subsequent processing. Strong acid is often used as a cleaning solution for surface cleaning of steel...

AI Technical Summary

Problems solved by technology

Organic corrosion inhibitors basically use the polar groups with nitrogen, phosphorus, sulfur, etc. as the central atom in the molecular structure to form coordination bonds with metal surface atoms to form a continuous or discontinuous adsorption on the metal surface. film, so as to achieve the purpose of corrosion inhibition; the main principle of action of metal salt corrosion inhibitors is to use the oxidation of high-valent metals to form a passivation film on the metal surface or to use certain metal ions to adsorb on the surface to generate steric hindrance. to prevent H + Close to the metal surface, or reduce the active position of the electrode, or change the structure of the electric double layer to affect the kinetic process of the electrochemical reaction, thereby reducing the corrosion rate

[0004] Although the currently used organic and metal salt pickling corrosion inhibitors can achieve relatively ideal corrosion inhibition efficiency, the following deficiencies generally exist in the engineering application process: 1) Only have corrosion inhibition ability, forming a stable protection on the surface of the material; After the film, it will also protect the dirt layer or rust layer, which slows down the pickling speed and affects the work efficiency; 2) Some components have certain toxicity, and the residual substances have safety problems, and follow-up treatment methods are also required. It can meet the requirements of environmental protection; 3) After cleaning, the surface metal is completely exposed and does not have the ability to prevent rust. It is easy to be oxidized in the air and rust again during the transportation or stay in the two sections, which is not conducive to subsequent surface treatment; 4) The adaptability is relatively narrow and can only be used in a single pickling system