Neuartiger Korrosionsschutz durch Self-assembled Monolayers aus derivatisierten leitfaehigen Polymeren Schlussbericht

Since more than ten years, systems of thiols or thioether on gold/silver are known in the case of self-assembled monolayers (SAM). These SAMs are based on the chemical affinity of anchor groups in molecules to the specific surface of electrodes. This leads to specific surface properties. In this research project, a process is developed to produce a new precoating with respect to corrosion protection of iron and low alloyed steel. After synthesis of suitable monomers, SAMs with polymerizable head-groups of thiophene derivatives are brought on iron. Subsequently, it is investigated if a crosslinked monolayer can be synthesized by electropolymerization of head-groups. 3-Thiophene hexyl phosphonic acid (THPA) and hexane phosphonic acids with head-groups of bithiophene (BTHPA and BT-bis-HPA) are synthesized and characterized by nuclear magnetic resonance spectroscopy. After pretreatments such as cleaning, grinding, degreasing and passivation, SAMs on passivated iron with anchor groups of phosphonic acids are produced. The following electropolymerization of the head-groups of the SAMs on iron is reproducible using bithiophene-hexaphosphonic acids (BTHPS, BT-bis-HPS). The polymerization of bithiophene as the head-group also is proved by cyclovoltammetry.SIGLEAvailable from TIB Hannover: F04B819 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekArbeitsgemeinschaft Industrieller Forschungsvereinigungen 'Otto von Guericke' e.V. (AIF), Koeln (Germany)DEGerman