Construction of ecofriendly anticorrosive composite film ZnAl‐LDH by modification of lignin on AA 7075 surface

Abstract

In this study, an environment‐friendly composite ZnAl‐LDH film modified by the rich biomass lignin was prepared on AA 7075 surface successfully. A wide range of characterizations was carried out to obtain the morphology, composition, and structure of this composite film, including scanning electron microscopy, X‐ray diffraction, Fourier transform infrared spectroscopy (FTIR), and so on. In addition, FTIR was used to investigate the complexing interaction between layered double hydroxide (LDH) and lignin. Finally, the corrosion protection ability of this composite film was evaluated by electrochemical impedance spectroscopy in an immersion period of 7 days in NaCl solutions. The results indicated that the ZnAl‐LDH film modified by lignin could provide effective corrosion protection for the underlying substrate in the whole immersion period, with almost one order of magnitude higher of the corrosion resistance in comparison with that in the case of the blank ZnAl‐LDH film after immersion of 7 days. Such results could provide inspiring insights into the development of composite inhibitors based on LDH and biomass.

Double‐anticorrosion ability of in‐situ superhydrophobic MgAl‐LDH coating with excellent stability of the corrosion resistance on magnesium alloy AZ31

“…In summary, LDH coating can effectively block the attack of water molecules and corrosion medium and inhale some chlorides into the interlayer corridor through an anion-exchange reaction. [36][37][38] Furthermore, the modification of PFOTMS provided the air film existed on the surface, which acted as another physical protection and prevented the invasion of water molecules and corrosive media into the LDH coating, leading to a better protective effect for the underlying substrate than LDHs without superhydrophobic treatment.…”

Preparation of Renewable Thiol‐Yne “Click” Networks Based on Fractionated Lignin for Anticorrosive Protective Film Applications

“…It is a topic of great importance due to the widespread use of metallic substrates, which require appropriate protection to extend their safe lifespan and limit environmental pollution. Lignin has been reported in corrosion protection applications, and it can be incorporated in various ways: either as a corrosion inhibitor used in solution, [7][8][9] as a deposited layer on a coating surface, [10,11] as a part of a polymeric blend applied on a metal surface, [10] or as a part of a resin used as a protective, anticorrosive coating. [10] Although lignin applied directly on the metal surface provides corrosion inhibition because of the formation of a lignin-metal complex, it lacks long-term corrosion inhibition in aggressive conditions, which may limit its use.…”

A Comparative Study of Chloride Adsorption Ability and Corrosion Protection Effect in Epoxy Coatings of Various Layered Double Hydroxides

“…It should be noted that the inhibitor release was closely related to the chloride adsorption ability based on the anion-exchange reaction, and higher chloride adsorption ability usually indicated a higher inhibitor anion capacity.In our previously published work, the MgAl-LDH and ZnAl-LDH powder samples intercalated with various inhibitors were synthesized and characterized, and they were then added in concrete and the corresponding corrosion protection mechanism in reinforced concrete was investigated [14][15][16]. In addition, the ZnAl-LDH films on Al substrate were also prepared and multifunctional modification towards it was carried out, and the corrosion protection mechanism was also studied deeply [17][18][19]. In the published literature, the role of chloride adsorption was always highlighted [13,20,21].…”