Metal Finishing Guide Book


Issue link:

Contents of this Issue


Page 285 of 903

Sample Ni-Sulphamate HS [10 A/dm2] Aurocor SC [��m] Post-treatment 0 1.5 ��m 0.3 None 1 1.5 ��m 0.3 Benchmark 1 2 1.5 ��m 0.3 Benchmark 2 3 1.5 ��m 0.3 Benchmark 3 4 1.5 ��m 0.3 Benchmark 4 5 1.5 ��m 0.3 Betatec Table 2: Part of the Sample Matrix Highlighting the Benchmark Products below that used in previous studies). Samples removed from the chamber were oven-dried at 80��C prior to pore examination, which was undertaken using a microscope together with Aquinto a4i docu/analysis software. Calculations Figure 7: Stable contact resistance values involved pore count per area and individual before (red) and after (orange) an 8-hour pore diameter, providing an overall % corpressure-cooker test. rosion area in accordance with the ASTM specification. Pores were size-categorized as follows: ��� ��� ��� ��� <0.05 mm 0.05���0.12 mm 0.12���0.4 mm >0.4 mm For each test specimen, a target area of 36 mm2 was used for each set of measurements. The process sequence used to prepare the samples was as per Figure 5. A total of 200 samples with a target gold thickness 0.3 ��m were prepared and examined alongside samples treated with commercially available corrosion inhibitors (Benchmarks 1���4). Table 2 highlights a small fragment of the experimental matrix used. After being subjected to 2 hours of NAV testing, all samples were categorized by calculating and evaluating the pore count per corroded surface area. Figure 6 compares the calculated corrosion area of the samples. CONTACT RESISTANCE MEASUREMENT Extensive measurements establish that treatment with Betatec post-dip does not cause an increase in contact resistance. The parameters: I = 10 mA, U = 20 mV, F = 5 cN were used to satisfy the EN IEC 512 standard. The mean value of 30 measurements was used for each test sample. 278

Articles in this issue

view archives of Metal Finishing Guide Book - 2012-2013