Determining Talcum in Coatings Using LIBS

Detecting contamination in materials can often be very challenging, especially when contamination levels are very low. Traditional methods frequently reach their limits in detecting these small amounts. Laser Induced Breakdown Spectroscopy (LIBS) offers an effective and sensitive alternative for trace contaminant analysis. This technology utilizes laser pulses to precisely map the chemical composition of material surfaces, making it particularly effective for identifying substances like talc. 

Detecting talcum in coating was also requested from one of our customers. We conducted elemental analysis using LIBS on both applied and pure coating samples prepared and analyzed with our Sci-Trace device. Results of analysis proved the presence of Mg, Si and O in all samples. We used Mg as the definitive marker, which exhibited an uneven distribution, being particularly less consistently detected in applied coatings compared to pure coatings. This disparity suggests a more heterogeneous distribution of Mg in pure coatings.

                                         Average emission lines of Si in applied coating samples

                                          Emission line of Mg detected in sample of pure coating

Using plosive mapping based on Mg, Si, and O detection, we mapped the uneven presence of talc within the coating samples, revealing its distribution in ppm. Our findings indicate that talc can be present in small amounts within coating materials, likely as an impurity. The uneven distribution of talc in applied coatings poses challenges for detection, which LIBS effectively addresses due to its sensitivity to variations in elemental composition.

The findings from this study highlight the effectiveness of LIBS in accurately detecting and mapping talc within coatings. This capability provides crucial insights that strengthen quality control measures and enable thorough assessments of product integrity in industrial applications. It equips us to deliver precise solutions that uphold stringent standards, ensuring the consistent reliability and performance of coated products across various industrial environments.