Tin-removal agent and preparation method thereof
A detinning agent, 5g technology, applied in the electrolytic detinning agent and its preparation field of electrolytic detinning on the surface of the conductive roller of the electro-tinning unit, can solve the problems of heavy metal lead in the detinning solution, environmental pollution, etc., and achieve good detinning effect, The effect of simple ingredients and convenient operation
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Embodiment 1
[0023] Sodium sulfate (Na 2 SO 4 ) and sodium chloride (NaCl) are dissolved in water, the addition of sodium sulfate is 60g / L, and the addition of sodium chloride is 20g / L; then add L-malic acid (C 4 h 6 o 5 ), its addition amount is 2g / L, then add sodium acetate (CH 3 COONa) 3g / L and acetic acid (CH 3 COOH) 5g / L, then the solution was stirred evenly, and the pH value of the detinning agent was measured to be 3.1;
[0024] Immerse the conductive roller that needs to be detinned in the configured detinning agent, and perform detinning according to the conventional electrolytic method, and control the current density 6 / dm 2 , Rotate the conductive roller of the tinning unit at a constant speed for 2 to 5 circles for 30 seconds, the tin layer on the surface of the conductive roller will dissolve into the tin remover, the surface will be smooth, and the roughness will recover more than 97.3%.
Embodiment 2
[0026] Sodium sulfate (Na 2 SO 4 ) and sodium chloride (NaCl) are dissolved in water, the addition of sodium sulfate is 55g / L, and the addition of sodium chloride is 25g / L; then add L-malic acid (C 4 h 6 o 5 ), its addition amount is 3g / L, then add sodium acetate (CH 3 COONa) 4g / L and acetic acid (CH 3 COOH) 4g / L, then the solution was stirred evenly, and the pH value of the detinning agent was measured to be 4.2;
[0027] Immerse the conductive roller that needs to be detinned in the configured detinning agent, and perform detinning according to the conventional electrolytic method, and control the current density to 4 / dm 2 , Rotate the conductive roller of the tinning unit at a constant speed for 2 to 5 circles for 45s, the tin layer on the surface of the conductive roller will dissolve into the tin remover, the surface will be smooth, and the roughness will recover more than 96.5%.
Embodiment 3
[0029] Sodium sulfate (Na 2 SO 4 ) and sodium chloride (NaCl) are dissolved in water, the addition of sodium sulfate is 50g / L, and the addition of sodium chloride is 30g / L; then add L-malic acid (C 4 h 6 o 5 ), its addition amount is 5g / L, then add sodium acetate (CH 3 COONa) 5g / L and acetic acid (CH 3 COOH) 3g / L, then the solution was stirred evenly, and the pH value of the detinning agent was measured to be 4.8;
[0030] Immerse the conductive roller that needs to be detinned in the configured detinning agent, and perform detinning according to the conventional electrolytic method, and control the current density 6 / dm 2 , Rotate the conductive roller of the tinning unit at a constant speed for 2 to 5 circles for 60 seconds, the tin layer on the surface of the conductive roller is dissolved in the tin remover, the surface is smooth, and the roughness is restored by more than 97.5%.
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Abstract
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