The test was performed according to this procedure

    1) a thin slide of  Titanium grade 5 was machine to produce   a 3mm hole in the center

    2) the sample was observed with 2 mm resolution using a confocal microscope  with laser scanning
    3) the sample was merged in a 3% NaCl+ water  solution for a period of two months
    4) the sample was re-scanned  in the same region and compared

 
 
before...... and after immersion
documentdate9508637610000documentscale1.0000004.0000003500.0000003500.000000documentorigin0.0000000.000000-1750.000000-1750.000000documentlabelbitschannelsxydocumentunitaduchannelumumhistorydateFriday, February 18, 2000 09:48:30historyoperator2fotonihistorylocationmagic labhistorysamplecellshistorylineT60Ihistoryage4dayshistorydyerhodaminehistoryconcentration30nMhistorybatch334historytemperature25ChistoryprocedureAllen 1historyexcitation_wavelengthbluehistoryexcitation_NDinhistorypinholegrandehistoryexcitation_dichroic_mirrormiddlehistoryobjective4.0historyemission_dichroic_mirrormiddlehistoryBA1outhistorygain111historyBA2outhistorygain20historyBA3outhistorygain30historypixeltime24.6 ushistorynonenonehistorynonenoneview1Position0.0867190.090072view1Size0.4093750.555783view1Port2view1Cursor0.9707030.304688view1Color00000view1BlackLevel0.000000view1Saturation255.000000view1Gamma1.000000view1Live1view1Synchronize1view1ShowIndex1view1AutoResize1view1UseUnits0view1Zoom1.000000view1AnnotationRuler-38180-30188view1AnnotationRuler-86448-9457view1AnnotationRuler-35191-27199viewcount1 documentdate9573553760000documentscale1.0000004.0000003500.0000003500.000000documentorigin0.0000000.000000-777.000000-549.500000documentlabelbitschannelsxydocumentunitaduchannelumumhistorydateWednesday, May 03, 2000 14:58:04historyoperator2fotonihistorylocationmagic labhistorysamplecellshistorylineT60Ihistoryage4dayshistorydyerhodaminehistoryconcentration30nMhistorybatch334historytemperature25ChistoryprocedureAllen 1historyexcitation_wavelengthbluehistoryexcitation_NDinhistorypinholegrandehistoryexcitation_dichroic_mirrormiddlehistoryobjective4.0historyemission_dichroic_mirrormiddlehistoryBA1outhistorygain127historyBA2outhistorygain20historyBA3outhistorygain30historypixeltime3.0 ushistorynonenonehistorynonenonehistorynonenoneview1Position0.0445310.038895view1Size0.4093750.555783view1Port2view1Cursor0.2949220.939453view1Color00000view1BlackLevel0.000000view1Saturation255.000000view1Gamma1.000000view1Live1view1Synchronize1view1ShowIndex1view1AutoResize1view1UseUnits0view1Zoom1.000000view1AnnotationRuler-38180-30188view1AnnotationRuler-86448-9457view1AnnotationRuler-35191-27199view1AnnotationRuler546240644257viewcount1
before...... and after immersion
These are the details of the the edge of in  the upper right part . The small track carved on it has dimension of the order of 5 mm. : no evident corrosion effects are seen after immersion. This correspond to an estimated corrosion rate of less than
0.25 mm in 10 years