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Approach to non-corrosive fluxes for further reduced residue solubility and improved magnesium tolerance

机译：采用非腐蚀性助焊剂的方法，可进一步降低残留物溶解度并提高镁耐受性

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For more than 30 years, potassium fluoroaluminates (NOCOLOK) fluxes are already successfully used in controlled atmosphere brazing (CAB) of aluminium heat exchangers. Residues of these so-called non-corrosive fluxes have very low - but evident - solubility in water [1] [2]. In the discussion about corrosion of CAB produced aluminium heat exchangers, the flux residue solubility is an important parameter. There are concerns that - in addition to several other factors - fluoride ions (F~-) potentially released from dissolved residue play a role in aluminium corrosion. A theoretical option to address this point is the development of virtually insoluble flux. More realistic, however, will be fluxes with less soluble residues than the current compositions. Some commercialised NOCOLOK derivates, like NOCOLOK Li Flux show already reduced solubility when compared to the standard product [1]. While investigating the chemical possibilities for further minimising the residue solubility and the release of F~- ions, we have developed NOCOLOK variants in combination with selected inorganic fluorides. During this R&D project we also looked closely at the brazing properties of the new fluxes - with a focus on their performance for brazing of aluminium alloys with higher magnesium level. The current maximum magnesium range suitable for CAB with standard NOCOLOK Flux is approximately 0.3%. Some improvement can be seen when using caesium-containing NOCOLOK formulations (up to 0.5% Mg) [3] [4]. Some of the new fluxes we developed for further reduced residue solubility surprisingly show higher magnesium tolerance. This paper summarizes the results of our laboratory work related to the development of fluxes with further reduced residue fluorides solubility and improved magnesium tolerance.
机译：30多年来，氟铝酸钾（NOCOLOK）助焊剂已成功用于铝热交换器的可控气氛钎焊（CAB）。这些所谓的非腐蚀性助焊剂的残留物在水中的溶解度非常低，但很明显[1] [2]。在讨论CAB生产的铝制热交换器的腐蚀问题时，助焊剂残渣的溶解度是一个重要参数。除了一些其他因素外，人们担心的是，溶解的残留物中可能释放出的氟离子（F〜-）在铝腐蚀中起作用。解决这一问题的理论选择是开发几乎不溶的助焊剂。然而，与当前组合物相比，具有更可溶残留物的助焊剂将更现实。与标准产品相比，某些商品化的NOCOLOK衍生物，例如NOCOLOK Li Flux的溶解度已经降低。在研究进一步降低残留物溶解度和F-离子释放的化学可能性的同时，我们开发了NOCOLOK变体与选定的无机氟化物结合使用。在此研发项目中，我们还密切关注了新型焊剂的钎焊性能-重点研究了它们对高镁含量铝合金的钎焊性能。当前适用于标准NOCOLOK通量的CAB的最大镁含量约为0.3％。当使用含铯的NOCOLOK配方（最高0.5％Mg）时，可以看到一些改进[3] [4]。我们为进一步降低残留物溶解度而开发的一些新助焊剂令人惊讶地显示出更高的镁耐受性。本文总结了与开发助熔剂有关的实验室工作的结果，助熔剂的残留氟化物溶解度进一步降低，镁耐受性提高。

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