Structural Characterization, Global and Local Electrochemical Activity of Electroless Ni–P-Multiwalled Carbon Nanotube Composite Coatings on Pipeline Steel

Metals

Leandro Antônio de Oliveira¹  Mara Cristina Lopes de Oliveira¹  Renato Altobelli Antunes¹  Jefferson Thadeu Dias de Oliveira¹  Rejane Maria Pereira da Silva²  Nelson Batista de Lima²  Olandir Vercino Correa² 

[1] Center for Engineering, Modeling and Applied Social Sciences (CECS), Federal University of the ABC (UFABC), Santo André 09210-580, SP, Brazil;IPEN/CNEN-SP, Av. Prof. Lineu Prestes 2242, Cidade Universitária, São Paulo 05508-000, SP, Brazil;

关键词: Ni–P/MWCNT composite coatings;    electroless deposition;    corrosion;    scanning electrochemical microscopy;   

DOI  :  10.3390/met11060982

来源: DOAJ

【 摘 要 】

In this work, composite Ni–P-multiwalled carbon nanotube films were produced by electroless deposition. The main goal was to investigate the influence of multiwalled carbon nanotube loading on the local electrochemical behavior of the composite films, as probed by scanning electrochemical microscopy (SECM). The coatings were also characterized with respect to their crystalline structure, surface, and cross-section morphologies. Adhesion strength was examined by scratch tests. The global electrochemical behavior was evaluated by potentiodynamic polarization. The local electrochemical activity was investigated by probing the Fe²⁺ oxidation in the surface generation/tip collection mode of the SECM. The results revealed that multiwalled carbon nanotubes increased the adhesion strength and reduced the electrochemical activity on the surface of the coated samples.

【 授权许可】

Unknown