Failure fracture cleaning method and solution for cleaning

Abstract

The invention discloses a failure fracture cleaning method and solution for cleaning. Sediments and loose covering matters on the surfaces of fractures are cleaned; the fractures are ultrasonically cleaned to remove the covering matters and oil stains on the surfaces of the fractures; the surfaces of the fractures are coated by colloidal solution prepared by acetone and cellulose acetate; after the coated layers are totally dried, the coated layers are stripped, and the operation is repeated by multiple times to finish cleaning of the fractures; and the fractures are cleaned by adopting cleaning solution prepared through adding of water in hydrochloric acid and urotropine. The fracture cleaning formula is simple in preparation, low in cost and mild in cleaning effect, is used by combiningwith a step-by-step cleaning method by multiple times to preferably remove corrosion products for corrosion failure of the surfaces of the fractures by carbon steel materials, and meanwhile, is lowerin damage of the fractures.

Description

technical field [0001] The invention belongs to the technical field of fracture analysis of failure components, and in particular relates to a failure fracture cleaning method and a cleaning solution, which can be used to remove corrosion products on the surface of carbon steel failure fractures and prepare qualified microscopic analysis samples. Background technique [0002] Failure fracture is the most important physical evidence in fracture failure analysis, which records the whole process of fracture initiation, expansion and final fracture of components under load and service conditions. Therefore, the fracture is a direct clue to find the cause of the failure and avoid the recurrence of the same type of failure. However, in actual production, especially in failure fractures of oil and gas fields, due to the inevitable presence of corrosive media in service conditions, the fracture is often covered by a thick layer of corrosion products, which hinders the microscopic an...

AI Technical Summary

Problems solved by technology

[0005] 2) Use cellulose acetate and acetone to prepare a colloidal solution to peel off the attachments from the fracture; the above two methods have a good cleaning effect on the sediment and oil stains attached to the fracture surface, but the removal effect on the corrosion products on the fracture little;

[0006] 3) For corrosion products, dilute hydrochloric acid or hydrochloric acid + corrosion inhibitor is generally used to clean up, but due to the low pH value of hydrochloric acid, when processing samples, a little carelessness will cause fatal damage to the fracture, so use hydrochloric acid + Corrosion inhibitors are used to clean the fracture. While cleaning the corrosion products, the corrosion rate can be reduced by adding corrosion inhibitors, which can protect the fractures to a certain extent. However, the type and dosage of corrosion inhibitors are not clearly defined. It brings great confusion to the actual use of technicians

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