SU947752A1 - Contact liquid for ultrasonic checking - Google Patents

Description

The invention relates to non-destructive methods of quality control of products and can be used for ultrasonic testing, complex relief castings from steel and cast iron with various forms of graphite on the untreated surface.

A known contact fluid for ultrasonic testing, containing water, a corrosion inhibitor and polyvinyl alcohol 1.

After drying, this liquid forms a poorly water-soluble film on the surface that must be removed manually, which makes it difficult to mechanize and automate its removal in washers. An additional hay / during repeated control requires its indispensable removal, and the deficiency of polyvinyl alcohol creates additional difficulties for its use with large volumes of control.

Closest to the offer is a contact ultrasound control fluid containing a lead, a surfactant, a corrosion inhibitor and a thickener in the form of dextrin and glycerin 2.

A disadvantage of the known liquid is the high cost and deficiency of the constituent components, which makes it difficult to use with daily mass control.

The purpose of the invention is to reduce the cost of fluid.

The goal is achieved by the fact that in a contact liquid containing water, a surfactant, a corrosion inhibitor and a thickener, cellulose-glycolic acid sodium salt is used as a thickener with the following ratio of components, wt.%: Sodium cellulose-glycolic acid salt3 -7

Claims (2)

Surfactant20.2-0.6 Corrosion Inhibitor0.1-1.0 Water Else The content of sodium soda or liquid should be 3-7%, since at 25 a smaller amount of it, the viscosity decreases significantly, and at greater a saturated solution is obtained in the form of a gelatinous mass. Sufficient wettability of the liquid ensures the content of surfactant substance (surfactant) in it 0.2-0.6%, since a smaller amount of it decreases the wettability, and with more it becomes economically inexpedient to increase the consumption of the surface-acoustic substance. The content of corrosion inhibitor in the range of 0.1-1.0% is due to the fact that in this case the controlled surfaces are not oxidized when exposed to contact liquid until it is completely dry. In this case, the surfaces, for example, steel castings are not oxidized when the content of the inhibitor is early or more than 0.1%, and to control cast iron, its amount in the liquid should be in the range of 0.8-1.0%. Water is the base. The sodium salt of cellulose-glycolic acid according to MRI 6.05-1098-67 is a by-product of the pulp and paper industry. As a surfactant, you can use any. Soap and laundry detergents. The corrosion inhibitor is sodium nitrous oxide (NaNOi) according to GOST 4197-66. For the preparation of contact liquid, NaNOz is first dissolved in water. and surfactant, and then with thorough stirring the sodium salt of cellulose-glycolic acid until it is completely dissolved. After the ultrasound monitoring, the fluid is removed with a cloth or sf c. cleaning solutions or water. When dried, it forms a water-soluble film on the surface, is easy to clean, also with a brush. The proposed contact liquid is easily removed in washers and does not have a corrosive effect. It is non-toxic, does not burn, is not explosive, does not pollute the environment, and does not affect the skin of hands. The fluid allows repeated inspection without prior removal. It is stored in a tightly closed container for an unlimited time. Approximate cost of 1 ton of liquid is 25 rubles. The application of the proposed contact liquid provides reliable ultrasonic monitoring of complex relief castings of steel and cast iron with various forms of graphite on the untreated surface. Claims of the invention Ultrasonic control contact liquid containing water, surfactant, corrosion inhibitor and thickener, , in order to reduce the cost of the liquid, the sodium salt of cellulose-glycolic acid was used as a thickener in the following ratio of components, wt.%: H trieva salt pulp and glycolic kisloty3-7 Surfactant veschestvo0,2-0,6 corrosion inhibitor 0.1-1.0 Water Balance Information sources received attention in the examination of 1.Avtorskoe № Certificate USSR 534684, cl. G 01 N 29/04, 1976. 2. USSR author's certificate number 468146, cl. G 01 N 29/04, 1972 (prototype).