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Single-source fluorescent corrosion inhibitor for leak detection. Disclosure Number: IPCOM000245128D
Publication Date: 2016-Feb-10
Document File: 7 page(s) / 231K

Publishing Venue

The Prior Art Database


Disclosed is a method to generate a fluorescent molecule that also acts as a corrosion inhibitor for water-cooling applications.

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This is the abbreviated version, containing approximately 41% of the total text.

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-source fluorescent corrosion inhibitor for leak detection

source fluorescent corrosion inhibitor for leak detection .

High-performance systems have rapidly migrated to water-cooling solutions to effectively remove the massive heat load from the CEC. The system design calls for a flexible tubing option incorporating a large number of connections to a cold plate/heat sink. Restrictions on the tubing material choice present a challenge to ensure adequate product reliability. As designs push to bring cooling inside nodes, reliability becomes a must to prevent catastrophic failure of electrical components. It is, therefore, important that any leak is identified as a leak or determined to be something else. Identification of leaks helps the development teams find solutions to these types of problems without the risk of catastrophic failure through early detection. In a more recent potential leak case, a cold plate manifold assembly showed the presence of a white colored material that was immediately assumed to be benzotriazole. Blacklight illumination revealed a purplish fluorescence (see Figure 1 below) that is consistent with benzotriazole but did not determine fully that the corrosion inhibitor was present. Figure 2 below depicts Benzotriazole under blacklight in an aluminum pan. In fact, as can be seen from the FTIR spectra (see Figure 3a below), the purplish material was found to be flux that was used during brazing. Since the whitish material that was thought to be BTA was present, there were initial fears that one would have water leaking issues that could destroy expensive PCBs and PCB assemblies. Figure 3a shows FTIR spectra of whitish residue found on a barb that is brazed to a cold plate manifold assembly that was determined to be consistent with brazing flux (see Figure 3b).

Figure 1


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Figure 2

Figure 3a

Figure 3b


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    The goal of this invention is to create a new highly fluorescent, water-cooling, corrosion inhibitor that can serve both the same purpose as today's corrosion inhibitor and as a detectable taggant for easy characterization of a water leak. This taggant corrosion inhibitor also allows for easy characterization of a water spray if a quick disconnect is locked open, thus allowing individuals to determine what components and assemblies may need to be assessed before shipping a system or starting up a system.

    A single-source, fluorescent corrosion inhibitor (FCI) is synthesized by combining modified versions of the water soluble, corrosion inhibitor benzotriazole (BTA) and the water soluble, fluorescent molecule fluorescein by using Suzuki chemistry. The basic, unfunctionalized versions of these molecules are shown in Figure 4. The modified version of these molecules can be prepared in a minimal number of simple reactions steps from commercially available starting materials. The FCI is then incorporated into closed-loop, water-cooling applications.

    Figure 4 depicts BTA and fluoresce...