Research On Automatic Detection Device For Plating Solution Additives And Tin Sludge Amount

With the continuous development of economy, tinplate has been widely used in many aspects of industrial production and daily life. Tin plating solution is the basic material during tinplate manufacturing process and determines the quality of tinplate. But both domestic and foreign tinplate manufacturers lack relevant automatic detection device and method at present.It is uneconomical and unpractical to detect every property of tin plating solution due to its complex components. Since low cohesion strength is the main failure form of tinplate, the impact of Sn2+, MSA, additives, tin sludge and temperature on the cohesion strength are studied in this paper. It is found that additives and tin sludge are two important factors which mainly affect tinplate cohesion strength.Based on this study results, two automatic detection devices about additives and tin sludge concentration are developed and studied. Because the content of additives can change liquid surface tension, the additives detection device has been designed and developed according to this theory. The friendly interface is coded containing several functions such as density detection, temperature control,data storage and so on. Its detection accuracy and repeatability can fully meet the industrial requirements for automatic detection.Besides experimental tests, different factors which affect droplet formation and rupture are also studied by using numerical simulation method.The formation and rupture process of tin plating solution droplet with different amount of additives, density and capillary tube inner diameter are simulated and the simulation results can provide theoretical support to guide the device improvement. A testing equipment is set up to detect the amount of tin sludge according to the transmission light theory. The influences of deposited time after mixing, temperature and ambient light on testing results are investigated and some solutions to avoid these effects are also discussed. From the testing results a fitting curve is regressed to predict the tin sludge concentration accurately.