Researching of biochemical degradation of electronic materials in fluid electrolytic mediums

A human body environment has a very composite chemical temper, which includes cations of metals, anions of salts and organic acids. Degradable processes that arise in this medium between biological system and implanted metallic modules chosen as biomaterials by the reason of superior mechanical properties that allow them to be used in load-applications can be harmful and must be explained. The standards ISO 10993 Part 15:2000, Part 17: 2002 and Part 18: 2003 determinate test claims for identification and quantification of bound medical products from metals and alloys; a document of German Institute for Standardization DIN 50905 Part 2: 1987 gives a general guidance on methods of metals corrosion explorations and corrosion testing. Accordingly to these standards investigation of chemical stability of the selected materials (in this case System 1 consist of FR4 with layers of Cu (85 mum) -Ni (6-7mum) -Pd (0.25 mum) -Au (0.06 mum); System 2 consist of Al₂O₃ substrate with thick film AgPt; System 3 -a silicon wafer, phosphor doted, crystallographic orientation <1 0 0>, thickness 375 mum) under dynamic influence of 0.9% NaCl water solution, synthetic blood plasma (SBF -simulated body fluid) and simulate liquor cerebrospinalis fluid during assigned time in settled conditions have been carried out, processes of surface degradation and alteration have been analyzed.