In this paper the technological fundamentals of dry ice blasting as a pre-treatment process for the electroplating of plastics are presented. The advantages compared to conventional pre-treatment are discussed. In a series of experiments the influence of the setting parameters of the surface area roughness and surface tension of the workpiece was investigated. Furthermore, the surface parameters, which influence the adhesion strength of the electro-coating process, were identified. Finally, a model in order was developed, to describe the correlation between the dry ice blasting setting parameters and the surface parameters was created.
Chemical cleaning methods are under strict restrictions due to the legislator, as they are often harmful to environment and health. Therefore, environmentally neutral cleaning methods will gain importance in the future. Alternative cleaning processes like blasting with solid carbon dioxide can substitute such harmful chemicals without residues of blasting media. CO2 snow blasting has a minor technical complexity with a possible high degree of automation, but is limited in its cleaning performance. Basic knowledge of CO2 formation must be gained in order to increase the cleaning performance. The basic dependencies of ambient pressure and temperature as well as the possibility of their manipulation regarding the produced CO2 particles were investigated. The investigations were conducted using design of experiments and lead to a model describing the CO2 snow formation and its properties. The goal was to manipulate the properties of the generated CO2 snow in order to optimise the technology regarding the cleaning task.
-For high quality electroplated products, surfaces must be thoroughly pre-treated. For this purpose electroplating currently needs a variety of chemical baths. The used chemicals are injurious to health and harmful to the environment. In addition, the conventional pre-treatment has a long process time which results in high costs. Dry ice blasting alone or in combination with other processes has the potential to completely substitute these conventional pre-treatment processes. Three process sequences as pre-treatment methods prior to electroplating were investigated on the aluminium alloys AlSi12 and AlMg3. The used processes are dry ice blasting, tempering during dry ice blasting and glass bead blasting followed by dry ice blasting. The influence of the parameters on the surface roughness, surface topography and surface tension of the workpieces was examined. A model to describe the correlation between the dry ice blasting parameters and surface parameters was developed. Finally, an adhesion test of electroplated specimen was conducted in order to determine the suitability of these alternative pre-treatment processes.
Für eine hohe Qualität von Galvanoprodukten müssen die Oberflächen vor dem Galvanisieren vorbehandelt werden. Dies wird derzeit über eine Vorbehandlung in einer Vielzahl von chemischen Bädern durchgeführt; das ist sowohl umwelt- als auch gesundheitsschädlich. Das Trockeneisstrahlen hat das Potential, konventionelle Vorbehandlungsverfahren zu substituieren. Auf Basis technologischer Untersuchungen wurde ein Modell zur Beschreibung der Einflüsse des Trockeneisstrahlens auf die Zielgrößen entwickelt. For high-quality electroplated products, surfaces must be sufficiently pre-treated. Currently, electroplating requires a variety of chemical baths for this purpose. The process is unhealthy and harmful to the environment. In addition, the conventional pre-treatment has a long duration. Dry ice blasting has the potential to substitute these conventional pre-treatment processes. A model to describe the correlation between the dry ice blasting parameters and surface parameters was developed.
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