RU2629682C1 - Liquid for cleaning controlled surface from penetrant exemption at capillary control by luminescent method - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to compositions of liquids used to clean a controlled surface from an excess of penetrant. The liquid contains a solvent and a surface active agent neonol AF 9/12.

EFFECT: improving the cleaning power of the cleaning liquid, increasing the time of preservation of the defect pattern of the complex configuration controlled parts having internal pockets and cavities, and increasing the control sensitivity.

5 tbl, 4 ex

Description

The invention relates to capillary inspection of non-destructive testing of parts, and in particular to the compositions of the liquids used to clean the controlled surface from excess penetrant. The control is carried out to detect defects that are invisible or poorly visible to the naked eye, which exit onto a controlled surface. The essence of the method is as follows: a layer of indicator penetrant is applied to the previously cleaned surface of the part to be controlled. Under the action of capillary forces, the liquid penetrates into the surface defect and is retained in it. After a certain period of time sufficient for penetration into the defect, the surface should be cleaned of excess penetrant with a cleaning fluid. Under the action of the developer, which is applied to the surface, the indicator penetrant is removed from the defect and forms the indicator pattern of the defect.

The method is widely used in the manufacture of parts from various materials, during maintenance and in operation. The sensitivity and quality of the control substantially depend on the composition, properties and quality of the flaw detection materials, including the composition of the cleaning liquids that are used in the control.

Known cleaning fluid ОЖ-1, which is used as a means for cleaning the surface with luminescent flaw detection. The main disadvantage of the cleaning fluid ОЖ-1 is the use of highly purified ethanol as its main component. Ethyl alcohol, according to some of its indicators, is not the best component of cleaning liquids, because, due to its high activity, it is a well-known luminescence quencher, which can reduce the sensitivity of control. Any contamination of the alcohol used enhances this effect. In addition, the composition of ОЖ1 includes the surfactant OP7 (OP10), which is not recyclable, and the discharge of washing water with the presence of this substance into wastewater is allowed in a limited amount.

It is known the use of a heated aqueous solution of neonol AF 9/12 to remove water-washable penetrant / RF Patent No. 2263900, G01N 21/91, publ. November 10, 2005 /. The disadvantage of this cleaning fluid is that it is designed to remove excess water-washable penetrant only and can cause corrosion of parts from low alloy steels. To reduce the corrosive effect of the part after treatment with flaw materials, they are subject to anticorrosion treatment, which lengthens and makes the control process more expensive.

Known cleaning fluid OZH-7A to remove excess penetrant LZh-18NV with luminescent flaw detection from the surface of controlled parts. The liquid ОЖ-7А consists of water, ethyl cellosolve and neonol AF 9/12. Ethyl cellosolve is ethylene glycol monoethyl ether and belongs to hazard class III, which requires safety measures and industrial sanitation. The liquid ОЖ7, which contains water, causes corrosion of steel parts, which requires additional anti-corrosion treatment.

Closest to the invention in technical essence and the achieved result is a cleaning fluid to remove penetrant during capillary inspection / RF patent No. 2033605, G01N 21/91, publ. 04/20/1995 /. The composition of the specified cleaning fluid includes gum turpentine and isopropyl alcohol in a ratio of 1: 1. Gum turpentine is a mixture of highly purified essential oils from various species of conifers. High cleaning increases the cost of turpentine and cleaning fluid. And accordingly, the cost of control as a whole. In terms of toxicity, turpentine belongs to hazard class III and has an irritating effect on the skin; for fire hazard - refers to flammable substances. Due to the presence of gum turpentine, the cleaning ability of the liquid is reduced, which reduces the sensitivity of the method. The cleaning fluid according to the patent of the Russian Federation No. 2033605 is selected as a prototype.

The objective of the present invention is to develop a cleaning fluid for luminescent flaw detection, devoid of these disadvantages, as well as achieving the following technical results: improving the cleaning ability (i.e., in the qualitative removal of excess indicator penetrant), increasing the retention time of the pattern of defects of controlled parts of complex configuration having internal pockets and cavities, as well as in increasing the sensitivity of control.

To eliminate these drawbacks of the cleaning fluid used by the RF patent No. 2033605, and to achieve the claimed technical results, a fluid (ОЖ-1М) is proposed for cleaning the surface from excess penetrant during luminescent flaw detection, including a solvent and a surfactant neonol AF 9/12.

A distinctive feature of the claimed liquid is that, as a solvent, the liquid contains isopropyl alcohol and neonol AF 9/12 in the following ratio of components: neonol from 15 to 25, mass%, isopropyl alcohol - the rest.

The composition of the cleaning fluid ОЖ-1М proposed above has an additional low toxicity and fire hazard, which is achieved by replacing turpentine with the surfactant neonol.

Replacement of gum turpentine with a surfactant neonol AF 9/12 reduces fire hazard, toxicity of the composition. Neonol AF9-12 is a highly effective nonionic surfactant that is moderately hazardous in terms of its effect on the human body. The cleaning fluid ОЖ-1М due to the absence of gum turpentine in the composition is less flammable and toxic. In addition, contaminated liquid ОЖ-1М has an increased biodegradability.

Examples of the implementation of the claimed invention are as follows.

Example 1. The purpose of the study is to evaluate the cleaning ability of the fluid ОЖ-1М, i.e. how effectively penetrant is removed from various metal surfaces during capillary luminescent control. The following objects were used in the experiment:

- polished round samples made of titanium alloy;

- polished nitrided samples of a rectangular shape from sheet steel of grade 11X11N2V2MF (EI 962) manufactured by Perm Motors OJSC.

- steel blades of the compressor rotor (from the same steel), used

- oxidized turbine rotor blades from alloys ZhS6, ZhS6U-VI and EP-220VD, both monolithic and hollow, which were in operation.

Samples and blades were successively treated with LZH-6A penetrant, washed with water, then OZh-1M cleaning liquid, then again with water (as provided for by the luminescent control process according to OST 90282-79). In the experiment, the modes of processing objects with the indicated liquids were selected as the most stringent within the limits provided by the standard. The penetrant on the samples and blades was applied with a brush, kept for 3-5 minutes, after that (to prevent its thickening), a second layer of penetrant was additionally applied. It was removed from 4 surfaces of the objects of the experiment by washing with water at a temperature of about 30 ° C for 15 s (according to OST 90282-79 this time can be up to 15 minutes). Then the objects were immersed in the cleaning fluid ОЖ-1М and kept in it for up to 15 minutes. After that, the samples and blades were again washed with water at a temperature of about 30 ° C for 60 s (according to OST 90282-79 this time should not exceed 15 minutes) and examined under irradiation with ultraviolet rays. The results of the study are presented in table 2.

As a result of the studies, it was revealed (see Table 2) that on polished samples of titanium alloy, on polished nitrided steel samples, on compressor blades and on all turbine blades, defects appeared as solid bright lines on a velvety-black background, which corresponds to a particularly high sensitivity level according to OST 1 90243-83. And also this indicates that the penetrant was not washed from the samples due to a significant increase in the residence time in the cleaning fluid ОЖ-1М.

Example 2. An experiment was conducted on the ability of the liquid ОЖ-1М to remove red penetrating liquid "K" from a metal surface. Previously, oil-kerosene mixture was used to remove this liquid. But experience shows that there are difficulties in removing penetrant (“K” fluid) when inspecting parts of complex shape by means of color defectoscopy, from which this liquid is difficult or impossible to remove with a kerosene oil mixture.

In this experiment, the liquid "K" was applied with a brush to flat steel plates in 3 layers with exposure after applying the 1st and 2nd layers for 1.0 ... 1.5 minutes. Preventing drying of the last layer, ОЖ-1М cleaning liquid was applied to the plates with a brush, kept for 30 ... 40 s and the plates were washed with water.

In this case, the liquid "K" was removed from the surface of the plates. Therefore, the cleaning fluid ОЖ-1М is able to remove penetrating liquid "K".

Table 3. Comparative evaluation of data on the removal of fluid "K"

Example 3

A comparative assessment was carried out on control samples of type 2 (according to EN 3452) with five cracking centers and full-scale parts with natural defects in the amount of 50 pieces. As penetrant, we used the reference penetrating fluid LV6A, for the manifestation of indications, the reference developer PR1. The results are presented in table 4. The control results in this experiment show the following:

1) Due to the background glow (see column 3), which appears after washing the surface with a cleaning fluid, adopted as a prototype, the brightness deteriorates, which is fundamentally important when evaluating indications;

2) The clarity of the patterns of indications (column 5), which depends on the quality of washing, when using cleaning fluid ОЖ1М, is also higher;

3) Increasing the processing time of parts from 1 minute to 5 minutes without compromising the quality of control is a significant advantage when processing large-sized parts and parts of complex configuration;

4) The quality of the luminescent control (column 9) when using ОЖ1М cleaning liquid also improves: of 50 samples with natural defects, defects appeared on all samples, in contrast to the control with a cleaning liquid, adopted as a prototype, where defects on 10 samples did not appear.

Example 4. In this experiment, we measured the processing time of parts according to classical technology (GOST 9 909) and using cleaning fluid ОЖ-1М. The research results are presented in table 5.

The data obtained indicate that the use of OZh-1M cleaning fluid leads to an increase in the processing time of controlled parts of complex configuration having internal pockets and cavities. So, instead of 1 minute using classical technology, it becomes possible to carry out control from 5 to 15 minutes. Thus, the retention time of the pattern of defects of controlled parts of complex configuration is increased. When using liquid ОЖ-1М, the penetrant is not washed out of defects and the control sensitivity decreases.

One of the main indicators that emits the claimed liquid is its implementation and serial use in the practice of luminescent control. None of the liquids presented in the available patents are included in the LUM-1OV kit and are not used in series at any of the aircraft manufacturing enterprises.

Claims (3)

A liquid for cleaning the surface from excess penetrant during luminescent flaw detection, including a solvent and a surfactant neonol AF 9/12, characterized in that isopropyl alcohol is used as a solvent, and neonol AF9 / 12 is used as a substance that increases the flushing ability in the following ratio of components % mass: Neonol AF 9-12  15 - 25 isopropyl alcohol rest