Natural Product-Derived Phosphonic Acids as Corrosion Inhibitors for Iron and Steel

被引:9
作者
Ruf, Erik [1 ]
Naundorf, Tim [1 ]
Seddig, Tom [1 ]
Kipphardt, Helmut [2 ]
Maison, Wolfgang [1 ]
机构
[1] Univ Hamburg, Dept Chem, Bundesstr 45, D-20146 Hamburg, Germany
[2] Metall Chem Technol GmbH, Kaiser Wilhelm Str 93, D-20355 Hamburg, Germany
来源
MOLECULES | 2022年 / 27卷 / 06期
关键词
corrosion; corrosion inhibitors; phosphonic acids; ALKYLPHOSPHONIC ACID; SURFACE MODIFICATION; CHEMICAL-STRUCTURE; PHOSPHINIC ACIDS; RADICAL-ADDITION; PASSIVATION; PERFORMANCE; DERIVATIVES; PROTECTION; MONOLAYERS;
D O I
10.3390/molecules27061778
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Organic acids, typically derived from an oil-based value chain, are frequently used as corrosion inhibitors in industrial metal working fluids. The criteria for selection of these corrosion inhibitors have changed in the last decades, and are today not only performance-driven, but influenced by ecological considerations, toxicity and regulatory standards. We present scalable semisynthetic approaches to organic corrosion inhibitors based on phosphonic acids from renewable resources. They have been evaluated by chip filter assay, potentiodynamic polarization measurements, electrochemical impedance measurements and gravimetry for corrosion protection of iron and steel in an aqueous environment at slightly alkaline pH. The efficacy of several phosphonic acids tested was found to be strongly dependent on structural features influencing molecular self-assembly of protective layers, and the solubility of salts formed with di- and trivalent cations from the media or formed during corrosion. A carboxyphosphonic acid (derived from castor oil) was found to have remarkable anticorrosive effects in all media tested. We attribute the anticorrosion properties of this carboxyphosphonic acid to the formation of particularly stable protective layers on the metal surface. It might thus serve as a commercially attractive substitute for current acidic corrosion inhibitors, derived from renewable resources.
引用
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页数:17
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