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Technical Discussions
Pablo Emilio Guzman
NDT Inspector,
Ingenieros Especialistas, Colombia, Joined Sep 2015, 5

Pablo Emilio Guzman

NDT Inspector,
Ingenieros Especialistas,
Joined Sep 2015
01:35 Nov-02-2015
MT bath contamination
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Current sample

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In our magnetic bench, the bath oil sample is showing a highly fluorescent color, more than normal. That is due to what?, until what level of fluorescent must consider before to replacement?. Thanks a lot for your comments.

Toma Alexandru
NDT Inspector,
NORD TEST SOFT, Romania, Joined May 2011, 13

Toma Alexandru

NDT Inspector,
Joined May 2011
08:29 Nov-02-2015
Re: MT bath contamination
In Reply to Pablo Emilio Guzman at 01:35 Nov-02-2015 (Opening).

Naturally, fluorescence in the liquid vehicle can detract from the contrast of fluorescent indications. It can also signal the breakdown of fluorescent magnetic particles into their components. A fluorescent magnetic particle bath composed of unattached fluorescent pigment along with non-fluorescent particles, whose indications cannot be seen under ultraviolet radiation, is not usable and should be discarded.
Three different conditions can lead to fluorescence in the supernatant liquid after settling is complete, but not all of them indicate a substandard bath. Fluorescent oils or grease can be swept into the bath from test surfaces, making the whole liquid fluorescent. Particles can break apart, leaving tiny slow settling fragments of fluorescent but nonmagnetic pigment behind. Finally, some very small but complete particles can escape agglomeration and, settling at individually slow rates, may require another hour or more to finally settle out.

ISO 9934-2 7.6 Fluorescence of carrier liquid
The fluorescence of the carrier liquid shall be checked by visually comparing with quinine sulphate solution when irradiated with UV-A of at least 10 W/m²
The concentration of the quinine sulphate solution shall be 7 × 10-9 M (5,5 ppm) in 0,1 N H2SO4.
The carrier liquid under test shall exhibit no more fluorescence than the quinine sulphate solution.


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