[0022] Implementation example figure 1 As shown, the sample pre-processing device for the tin plate alloy-tin galvanic test of the present invention includes an industrial computer 1, a digital power supply 2, a controller 3, an electrolytic degreasing tank 4, a cleaning tank 5, and an electrolytic detinning tank 6. The industrial control The output ends of the machine 1 and the digital power supply 2 are respectively connected to the input ends of the controller 3, the electrolytic degreasing tank 4 is provided with an auxiliary electrode plate 41 and a sample 42 at intervals, and the electrolytic detinning tank 6 is provided with cathodes 61 at intervals. And sample 62, the controller 3 is provided with a polarity switch 31, the input end of the polarity switch 31 is connected to the output end of the digital power supply 2, and the output end is respectively connected to the auxiliary electrolytic degreasing tank 4 The electrode plate 41 and the sample 42 as well as the cathode 61 and the sample 62 of the electrolytic detinning tank 6. The cleaning tank 5 is provided between the electrolytic degreasing tank 4 and the electrolytic detinning tank 6.
[0023] Such as figure 2 As shown, preferably, the polarity switch 31 of the controller 3 includes a first relay SV1 and a second relay SV2, and the first relay SV1 and the second relay SV2 respectively include a normally closed contact NO. 1 , NO 2 And normally open contact NC 1 , NC 2 And public COM 1 , COM 2 , The common terminal COM of the first relay SV1 and the second relay SV2 1 , COM 2 Connect the auxiliary electrode plate 41 and sample 42 of the electrolytic degreasing tank 4 and the cathode 61 and sample 62 of the electrolytic degreasing tank 6 respectively, and the normally closed terminal NO of the first relay SV1 1 Connect the positive pole of the digital power supply 2 and the normally open terminal NC of the second relay SV2 respectively 2 , The normally closed terminal NO of the second relay SV2 2 Connect the negative pole of the digital power supply 2 and the normally open terminal NC of the first relay SV1 respectively 1.
[0024] This device has the advantages of high degree of automation, sample degreasing, high precision of detinning electrolytic treatment, high working efficiency, etc., and can effectively ensure the precision of tin plate alloy-tin galvanic couple test.
[0025] A sample pretreatment method for tin plate alloy-tin galvanic test includes the following steps:
[0026] Step 1. Set the sample in the electrolytic degreasing tank, and the industrial computer sends a degreasing command to the controller, and connects the positive and negative poles of the digital power supply with the auxiliary plate and the sample in the electrolytic degreasing tank through the polarity switch of the controller. And switch according to the set interval time, until the sample is degreasing in the electrolytic degreasing tank;
[0027] Step 2: Move the degreasing sample into the cleaning tank for cleaning, remove the impurities on the surface of the sample and then move it into the electrolytic degreasing tank;
[0028] Step 3. The industrial computer sends a detin command to the controller, and connects the positive and negative poles of the digital power supply to the sample and cathode in the electrolytic detinning tank through the polarity switch of the controller, such as image 3 As shown, the electrolysis current i and the electrolysis time t during the electrolysis detinning process are collected and the electrolysis detinning curve 7 is drawn, where the abscissa is the electrolysis time t and the ordinate is the electrolysis current i;
[0029] Step 4. The industrial computer judges the electrolysis current according to the electrolytic detinning curve. When the electrolysis potential no longer changes within 30 seconds, the sample detinning ends, and the sample detinning end prompt is issued;
[0030] Step 5. After the detinning of the sample is completed, move it into the cleaning tank for cleaning to complete the pre-treatment of the sample.
[0031] Preferably, when the sample is degreasing, the set interval time is performed with the auxiliary electrode plate of 2 seconds and the sample cycle of 0.1 seconds. The electrolytic treatment of the sample with multiple short flashes can strengthen the cleaning ability and improve the degreasing effect; at the same time, the switching time and cycle times of the positive and negative electrodes of the sample can be changed according to the degreasing effect of the sample. The process only needs to be controlled by an industrial computer. The controller sends corresponding instructions to improve the degree of automation.
[0032] Preferably, when the sample detinning starts, the digital power supply performs electrolysis with an electrolysis voltage not exceeding 1V. When the first inflection point of the electrolysis detinning curve appears, the industrial computer controls the digital power supply to adjust the output electrolysis voltage to 0.40V; When the second inflection point of the detinning curve appears, the digital power supply adjusts the output electrolysis voltage to 0.20V; when the third inflection point of the electrolysis detinning curve, the digital power supply adjusts the output electrolysis voltage to 0.10V; when the electrolysis voltage is close to zero and at 30 When there is no change within seconds, the industrial computer will send out the end of the sample detinning prompt.
[0033] Preferably, when the sample is degreasing, the industrial control computer issues a degreasing command of 0. At this time, the controller causes the polarity switch to switch the positive and negative poles of the digital power supply at an interval of 2 seconds for the auxiliary plate and 0.1 second for the sample; the sample is detinned When the industrial computer sends out the degreasing command as 1, the controller controls the polarity switch to connect the positive and negative electrodes of the digital power supply to the sample and the cathode in the electrolytic detinning tank.
[0034] The device and method adopt digital automation technology to replace traditional manual operation. The alternate switching of cathode and anode in the electrolytic degreasing process is automatically completed by the industrial computer and controller, and the output power of the digital power supply is automatically adjusted and judged by the characteristics of the electrolytic detinning curve. The end point of electrolytic detinning improves the sample pretreatment accuracy and work efficiency, thereby ensuring the accuracy of the tin plate alloy-tin galvanic test test.
