Sample pretreatment device and method for tinplate alloy-tin couple test

Abstract

The invention discloses a sample pretreatment device and method for a tinplate alloy-tin couple test. An industrial personal computer, a digital power source and a controller of the device are electrically connected. A polar plate and a sample are arranged in an electrolytic degreasing tank and an electrolytic detinning tank. The controller is provided with a polarity reversing switch. The polarity reversing switch switches the positive poles and the negative poles of the auxiliary polar plate and the sample and is connected with the negative pole of the electrolytic detinning tank and the sample. According to the sample pretreatment method, the industrial personal computer sends a degreasing instruction and a detinning instruction; during degreasing, the controller switches the positive poles and the negative poles of the auxiliary polar plate and the sample, degreasing of the sample is completed, and the sample is washed in a washing tank; during detinning, the controller enables thedigital power source to be communicated with the sample and the negative pole in the electrolytic detinning tank, an electrolytic current i and electrolytic time t are collected, and an electrolyticdetinning curve is drawn, the industrial personal computer judges the electrolytic current according to the electrolytic detinning curve, and when the electrolytic potential does not change any more,detinning of the sample is ended, and an ending prompt is given out. By the adoption of the sample pretreatment device and method, the sample pretreatment precision and the work efficiency are improved, so that the precision of the tinplate alloy-tin couple test is effectively guaranteed.

Description

technical field [0001] The invention relates to a sample pretreatment device and method for a tinplate alloy-tin galvanic couple test. Background technique [0002] Tin plate alloy-tin galvanic test is used to detect the corrosion resistance of tin plate, its working principle is to expose the pure tin electrode and the tin-iron alloy electrode of electroplated tin plate to the degassed special electrolyte, at a certain temperature After a certain reaction time, the current flowing between the two electrodes is measured. [0003] This test is one of the most important indicators to characterize the quality of food-grade tinplate. The purpose of the test is to simulate the corrosion of tinplate cans by the contents during the shelf life of food. The test conditions of tinplate alloy-tin galvanic couple test are extremely harsh, and there are strict requirements for sample pretreatment, sample sealing and measurement, especially sample pretreatment is one of the key factors t...

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Problems solved by technology

[0004] Sample pretreatment includes two aspects of sample degreasing and detinning. GB / T22316-2008 "Test Method for Corrosion Resistance of Electro-tinned Steel Sheets" provides the test method for tinned plate alloy-tin galvanic couple. Manual operation and end-point discrimination are required in the process, and there are disadvantages such as complicated operation, difficult method, and poor sample pretreatment effect, which seriously affect the accuracy of tinplate alloy-tin galvanic couple test

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