Department of Chemistry, Universität Hamburg, Bundesstraße 45, 20146, Hamburg, Germany.
Metall-Chemie Technologies GmbH, Herrengraben 30, 20459, Hamburg, Germany.
Amino Acids. 2023 May;55(5):665-678. doi: 10.1007/s00726-023-03260-x. Epub 2023 Mar 10.
We present alkali salts of amino acids as functional, non-toxic, non-hazardous, non-volatile, chemically stable, and cheap alkaline additives for common acidic corrosion inhibitors. The resulting mixtures have been evaluated for Co, Ni, and Cu leaching and were analyzed by chip filter assay, potentiodynamic polarization measurements, electrochemical impedance measurements, and gravimetry for corrosion protection of iron and steel in aqueous environment at slightly alkaline pH. Leaching of Co and Ni was found to depend on the corresponding complex stabilities. Taurine (Tau) as well as aminohexanoic acid (AHX) leads to low leaching of Co and Ni. Particularly AHX is an attractive low leaching additive leading to lower Co and Ni concentrations in solution than currently used amino alcohols. Glu and Tau were found to synergistically interact with several acidic corrosion inhibitors of the carboxylic acid and the phosphonic acid type. Tau had a particularly positive impact on the protective properties of carboxyphosphonic acids. Glu had also a positive effect on the anti-corrosive properties of several acidic corrosion inhibitors and served as an anti-scalant. Alkali salts of Glu and Tau might thus serve as commercially and ecologically attractive substitutes for current alkaline additives to acidic corrosion inhibitors.
我们提出了氨基酸的碱金属盐作为功能的、无毒的、非危险的、非挥发性的、化学稳定的、廉价的碱性添加剂，用于常见的酸性腐蚀抑制剂。所得到的混合物已被评估用于 Co、Ni 和 Cu 的浸出，并通过芯片过滤分析、动电位极化测量、电化学阻抗测量和重量法进行分析，以保护钢铁在微碱性 pH 值的水介质中的腐蚀。Co 和 Ni 的浸出取决于相应的配合物稳定性。牛磺酸（Tau）和氨基己酸（AHX）导致 Co 和 Ni 的浸出率低。特别是 AHX 是一种有吸引力的低浸出添加剂，导致溶液中的 Co 和 Ni 浓度低于目前使用的氨基酸醇。Glu 和 Tau 被发现与几种羧酸和膦酸类型的酸性腐蚀抑制剂具有协同作用。Tau 对羧基膦酸的保护性能有特别积极的影响。Glu 对几种酸性腐蚀抑制剂的抗腐蚀性也有积极的影响，并可用作防垢剂。因此，Glu 和 Tau 的碱金属盐可以作为商业和生态上有吸引力的替代品，用于当前的酸性腐蚀抑制剂的碱性添加剂。
