EFFECT OF TIN ADDITION ON THE PROPERTIES OF ELECTROLESS NI-P COATINGS

One of the advantageous properties of electroless Ni-P coatings is the good solderability, 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 structure. Thus, the investigation of...

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Bibliographic Details
Published inHungarian materials and chemical sciences and engineering (Online) Vol. 45; no. 1; pp. 50 - 62
Main Authors Czagány, Máté, Baumli, Péter
Format Journal Article
LanguageEnglish
Published Miskolc University of Miskolc 01.01.2020
Subjects
Alloying elements
Chemical composition
Differential scanning calorimetry
Equilibrium
High temperature
Investigations
Nickel coatings
Solderability
Solid solutions
Structural stability
Temperature
Thermal stability
Thermodynamic properties
Tin
Tin chloride
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Summary:One of the advantageous properties of electroless Ni-P coatings is the good solderability, 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 structure. 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 element 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 properties of the coating were investigated, such as chemical composition, thickness and appearance. Based on the experiments, 0.3 g/L SnCl2 was determined as the optimal concentration 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).
ISSN:3004-0000
3004-0817