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Characterizing galvanizing baths


Introduction
Automobile-parts production can be paralyzed by a defective electron-galvanizing (EV) bath line. Because a sensitive and accurate analysis of EV solutions is fundamental to productivity, quality, and identification of errors, a detailed analytical profile can help trace the source of error and contribute to selecting the best solution. Both downtime and material cost therefore can be minimized.

Fluorescence spectroscopy is an analytical technique with high sensitivity and selectivity. By characterizing the components in the EV-coat solution with fluorescence, a detailed analytical profile can be formed for each component. This can help trace the source of errors in the EV-coat solution, and contribute to selection of the best formulation. Quality-control tests can be preformed periodically to check for consistent bath composition.


Instrumentation
The SPEX FLUOROMAX spectrofluorometer was used in this investigation. The system is compact, economical, and offers several automated accessories. The FLUOROMAX is noted for its outstanding sensitivity, speed, and easy-to-use software.
High sensitivity is achieved by means of all-reflective optics and photon-counting detection.
Data acquisition is fast because the system can slew at 160 nm s1. Coupling sensitivity and rapid data acquisition creates a system that can function as an efficient and productive laboratory instrument.
Complete experiments can be stored in memory and recalled by a technician for push-button, menu-driven operation.

Therefore, spectra can be acquired in seconds, and a time-based scan can be collected at 1 ms/data point. Simplicity is apparent in the automation, computer-controlled variable slits, software, and calibration. For convenience, all of the controls are located
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