Papers by Keyword: Copper Coating

Abstract: In this paper, response surface methodology (RSM) was utilized for the experiment design of CuSO₄ and H₂SO₄ concentrations and current densities. RSM was also used to evaluate the significance of each parameter and its interaction on the adhesion strength of austenitic stainless steel substrate. Adhesion strength was investigated by a Teer ST-30 tester, and the structure of the samples investigated by using scanning electron microscopy (SEM). Results showed that increasing the concentration of CuSO₄ and decreasing theat of H₂SO₄ strengthens adhesion. Conversely, the current density only has a slight effect.

Abstract: Mechanical response of polyurethane open-cell foam with electrodeposited copper coatings under compressive loads is investigated via experimental characterization. Commercially available open-cell polyurethane foam specimens are copper deposited using electroless and electro-deposition techniques. Thickness and composition of the coating are controlled by varying the deposition time to 30, 60 and 90 minutes. Micrographs of the coated foam structure show that the coating thickness is higher at the outer surface, and the averaged thickness linearly depends on the deposition time. The coated foam exhibits a stiffer compressive response than that of the uncoated one. When unloaded, the copper coating layers fracture at the center of foams ligaments, and fall off from the foam structure.

Abstract: The effects of positive and reverse working time, electroplating time, current density, duty cycle on the weight-gain rate were investigated. The optimized technical parameters were as follows: room temperature, 300 ms of positive working time, 30 ms of reverse working time, 40% of duty cycle, 8.20 ×10-5 A/mm2 of current density, 6 min of electroplating time. The quality of copper coating was checked with SEM. The adhesion between the coating and carbon fibers was tested by the method of psychro-thermal cycles. Additionally, comparison to pulse plating and direct current plating was made. The obtained results showed that a flat, detailed and well-crystalloid copper coating on the carbon fiber surface was obtained with the present conditions. The adhesion between the coating and carbon fibers was 450kPa.