Phosphonic acid functionalization of nanostructured Ni–W coatings on steel

Abstract

 Robust and stable octadecylphosphonic acid self-assembled layers on nanostructured Ni-W coatings on steel were obtained by thermal annealing.  XPS, Raman, contact angle and electrochemical measurements confirm the functionalization and characteristics of the phosphonic layer.  The functionalized Ni-W samples exhibit high hydrophobicity and corrosion resistance in chloride containing solutions

Covalent Grafting of Alkyl Chains on Laser-Treated Titanium Surfaces Through Silanization and Phosphonation Reactions

“…Such decrease (-0.64 to -0.89 eV) of binding energy of P can be explained by the creation of a covalent bond with surface Ti-OH groups. Similar shifts between P 2p3/2 signal in free and bonded octadecylphosphonic acid were reported for the grafting on the surface of TiO2 (-0.2 eV [52]), Ta2O5 (-0.5 eV [53] and Ni-W (-0.8 eV [54]).…”

Ultrasonic-assisted electrodeposition of Ni/diamond composite coatings and its structure and electrochemical properties

“…Fine aggregates are gathered near the edges of the grains, which can be ascribed to the diamond particles. Unlike nodular shapes of the grains of the Ni–W [30] , [31] , Ni-Co [32] , [33] matrix, the Ni/diamond shows pyramids-like grains. It indicated that more diamond particles aggregated when the coatings were deposited with magnetic stirring.…”

Application of BP Artificial Neural Network in Preparation of Ni–W Graded Coatings

“…As the W content increases from 2.51% to 45.29%, the hardness of the coating enhances from 383.3 HV to 437.5 HV, indicating that the hard tungsten contributes to the hardness of coatings [36,37]. The study shows that when the content of W in the coating increases, the degree of lattice distortion of the alloy increases, and the resistance of dislocation movement also increases, which leads to the increase of the micro-hardness of the alloy [38,39].…”