A thermal acid etching device for low-magnification steel

Abstract

The invention relates to a rolled steel macrostructure hot acid etching device, which comprises an acid etching device (1) formed by a tank body (11) and a tank cover (12), and an electromagnetic induction heating device (2), wherein the electromagnetic induction heating device comprises an induction plate (21) and a heating plate (22); the tank body (11) is arranged on the induction plate (21); the heating plate (22) is located on the bottom part of the inner cavity of the tank body (11). The rolled steel macrostructure hot acid etching device provided by the invention adopts an electromagnetic induction heating method, so that the heat efficiency is high, the safety and reliability in use are realized, the acid etching temperature and the acid etching time can be accurately controlled, the accuracy of a rolled steel sample macrostructure test result is ensured, the production cost can be effectively reduced, and the environment pollution is reduced.

Description

technical field [0001] The invention relates to a thermal acid etching device for low-magnification structure of steel, in particular to a thermal acid etching device adopting electromagnetic induction heating, and belongs to the technical field of metal processing. Background technique [0002] Steel low-magnification structural defect inspection is also called macroscopic inspection, which can reflect the shape and distribution characteristics of microstructure and defects in the metal macroscopic area, and is an important steel quality inspection method. Steel low-magnification structural defect inspection includes hot acid etching test, sulfur printing test, phosphor printing inspection, etc., among which hot acid etching test is the most widely used. The hot acid etching test of the low-magnification structure of steel is generally carried out in the hot acid etching device, and the defects are observed after the hot acid etching of the steel by heating the acid solutio...

AI Technical Summary

Problems solved by technology

However, there are still obvious defects in the above-mentioned patents: one is to heat the acid solution through heat exchange, and this non-contact heating method obviously further reduces the thermal efficiency. It is roughly estimated that the thermal efficiency can only reach about 20%, and the energy consumption is serious; The contact heating method makes it more difficult to control the heating temperature and heating time. Obviously, this technical improvement that overcomes one defect but significantly aggravates the other two defects is not practical

[0004] There are three problems in the electric heating method: first, the thermal efficiency is low, which can only reach about 50% generally, and the heat energy discharge makes the surrounding temperature rise and the working environment deteriorates; In the conductive acid-etched tank, it is easy to be corroded and rupture and leak electricity, causing safety accidents such as equipment short circuit and even electric shock; third, the cost is high. Generally speaking, materials with good thermal conductivity are not acid-resistant, and acid-resistant materials have poor thermal conductivity. The prior art generally uses quartz glass that is both thermally conductive and acid-resistant, but the material of quartz glass is brittle, poor in processing performance, and not durable, so the structural cost and use cost are high; the fourth is that the heating temperature and heating time cannot be accurately controlled, and more Remote control cannot be realized, so the degree of hot acid etching of steel cannot be accurately controlled, which in turn affects the accuracy of steel low-magnification test results

However, the above-mentioned patents still have obvious defects: First, the acid mist collector neutralizes the absorbed acid liquid with the absorption liquid and then discharges it, which requires continuous consumption of the absorption liquid, and the acid liquid cannot be recycled and reused, so the overall cost is relatively high; The second is that the acid etching tank has a non-sealed structure, and the acid mist collector is located above the outside of the acid etching tank. Although the acid mist can be absorbed under the action of the exhaust fan, it cannot be completely absorbed, and a large amount of acid mist is still discharged directly. , its role in reducing environmental pollution is limited; the third is that acid mist is a high-temperature gas, which is easy to drift and diffuse. Without proper condensation, even if the power of the exhaust fan is increased or a larger volume of acid mist collector is selected, it is difficult to Absorb acid mist completely

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