A method of cleaning fractures of steel failed components

Abstract

The invention discloses a method of cleaning fractures of steel failed components and belongs to the technical field of fracture analysis of steel failed components. Aiming at disadvantages of steel failed fracture cleaning methods at present, such as problems of inconvenient preparation of cleaning liquids, poor cleaning effects, and low cleaning efficiency, the method of cleaning the fractures of the steel failed components, which has characteristics of simple cleaning fluid preparation, simple and convenient operation, short consumed time, significant cleaning effects and easy monitoring, is provided. A hydrochloric acid solution is adopted as a cleaning liquid in the method, an ultrasonic wave cleaning technology is used in cooperation, and compact corrosives on the fracture surfaces are conveniently and efficiently removed under the premise of not damaging fracture morphological features. The method is easy to implement, low in energy consumption and suitable for cleaning of various metal failed component fracture surfaces.

Description

technical field [0001] The invention provides a method for cleaning the fracture of steel failure parts, which is suitable for observing and analyzing the fracture of steel failure parts. Background technique [0002] Among the various failure modes in engineering applications, fracture failure is extremely harmful because of its unpredictable and sudden characteristics. The fracture of steel components is the most important physical evidence in fracture failure analysis, and sometimes even the only physical evidence. It records the irreversible deformation of the component before fracture under load and environment, and the whole process of crack initiation, propagation, and fracture. The fracture often appears in the weakest place in the metal structure, and records important information about the whole fracture process. The observation and analysis of fracture morphology can be used to infer the cause of fracture, and on this basis, put forward targeted preventive measur...

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Problems solved by technology

[0003] At present, the commonly used fracture cleaning methods mainly include: (1) Dry air flow or soft brush cleaning. This method can only remove loose particles attached to the fracture surface. For the corrosion products generated by chemical reactions on the fracture surface, due to their dense combination with the fracture surface , the removal effect is very poor; (2) cleaning with organic solvents such as acetone or alcohol, this method can only clean the grease and other pollutants attached to the surface of the fracture, and the cleaning effect on dense corrosion is poor; (3) AC paper lamination cleaning , although this method is effective for cleaning scale, etc., the cellulose acetate contained in AC paper is easy to remain on the rough surface of the fracture. Since cellulose acetate is not conductive, the residual cellulose acetate on the fracture surface will affect the fracture scan. The observation quality of the electron microscope; (4) Cleaning with chemical etching solution. The commonly used chemical etching solution is composed of a variety of reagents, and some of its components are not commonly used reagents or even toxic, such as sodium cyanide; in addition, some existing chemical etching solutions The liquid needs to be heated and used; the production process conditions of the chemical etching liquid are relatively complicated, and the pollution and energy consumption are relatively large in the operation process of using the chemical etching liquid to clean the fracture; (5) Ultrasonic cleaning, using ultrasonic waves to generate continuous instantaneous High pressure makes the dirt on the surface of the object fall off quickly. Ultrasonic cleaning has the advantages of high efficiency, time saving and low pollution. However, ultrasonic cleaning only has a good cleaning effect on loose attachments attached to the surface of the material, and the cleaning effect on dense corrosion is not ideal.

In the fracture cleaning method disclosed in the Chinese patent "A Method for Cleaning Stress Corrosion Fractures of Aluminum Alloys" (publication number 101736347A), although the reagents used for cleaning are all common reagents, the soaking time is long (2~4 hours); In addition, the cleaning method disclosed in this patent removes corrosion by controlling the immersion time, but does not give a specific calculation method for immersion time, and cannot monitor the immersion process in real time, and there is a risk of damage to fracture morphology due to excessive cleaning

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