Effect of Tin Addition on the Properties of Electroless Ni-P Coatings

Czagány, Máté and Baumli, Péter (2020) Effect of Tin Addition on the Properties of Electroless Ni-P Coatings. Materials Science and Engineering, 45 (1). pp. 50-62. ISSN 2063-6792

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Abstract

One of the advantageous properties of electroless Ni-P coatings is the good sol-derability, which is utilized in the electronic industry. However, the applied high-temperature required by the soldering process might lead to undesired transformation of the coating struc-ture. Thus, the investigation of the thermal stability of the coating has become more and more important among scientists, as by adding a new, 3rd element to the coating, the stability of the coating’s structure can be increased. In our research, the required conditions for the 3rd ele-ment were determined based on the hypothesis of kinetic stabilization, and tin (Sn) was found an appropriate alloying element. By adding SnCl2 precursor salt to the bath, the main pro-perties of the coating were investigated, such as chemical composition, thickness and ap-pearance. Based on the experiments, 0.3 g/L SnCl2 was determined as the optimal concen-tration with the applied bath composition. Subsequently, the thermal behaviour of the formed Ni-P-Sn coating was investigated by Differential scanning calorimetry (DSC) and X-ray diffraction analysis (XRD).

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