Nickel Exposure Test Series 2
Procedure:
Testing was performed on one M31 TiN coated magnet and one M36 TiN coated magnet. One nickel coated magnet was used as a control. Units were immersed in a saturated solution of 10ml of 10% Ammonia and Dimethylglyoxime at 22.2 C. At each time point, units were removed from solution and dried prior to being photographed. At hour 6, a surfactant was added to solution to ameliorate any surface shielding due to surface tension.
Nickel – Prior to exposure
Nickel – 30 Seconds Exposure
Nickel – 2 minutes Exposure
Nickel – 10 Minutes Exposure
M31 – Prior to Exposure
M31 – 30 Seconds Exposure
M31 – 2 Minutes Exposure
M31 – 10 Minutes Exposure
M31 – 40 Minutes Exposure
M31 – 2 Hours Exposure
M31 – 6 Hours
M31 – 20 Hours Exposure (14 With Surfactant)
M36 – Prior to Exposure
M36 – 30 Seconds Exposure
M36 – 2 Minutes Exposure
M36 – 10 Minutes Exposure
M36 – 40 Minutes Exposure
M36 – 2 Hours Exposure
M36 – 6 Hours
M36 – 20 Hours Exposure (14 With Surfactant)
Results
Unit Type
30 Sec
2 Min
10 Min
40 Min
2 Hr
6 Hr
20 Hr
Result
Nickel
+
+
+
+ (Control)
M31
–
_
–
–
–
–
–
–
M36
–
–
–
–
–
–
–
–
The nickel coated control unit immediately precipitated a rose-red coating of Ni(DMG)2. After a full coating of precipitate on the nickel unit was observed at minute 10, no further exposure tests were performed. After hour six, a surfactant was added to alleviate surface tension. Neither the M36 or M31 magnet caused formation of precipitate at any time during the procedure. These results are consistent with both tested units having a continuous and unimpaired coating of TiN. Results are consistent with Test Series 1, in which units were exposed for as long as 168 Hours without any precipitate forming.