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Properties of gradient Ni-P-PTFE coatings on stainless steel with different polytetrafluoroethylene concentrations.
- Source :
-
Thin Solid Films . Jun2024, Vol. 799, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- • Ni-P-PTFE gradient coatings were prepared by electroplating and electroless plating. • Gradient coatings can effectively improve the adhesion strength of the coating. • Gradient coatings have little effect on mechanical properties and wettability. • When the concentration is (25 + 50) mL/L, the gradient coatings show the best comprehensive performances. Ni-P-PTFE (polytetrafluoroethylene) coatings were prepared on stainless steel surfaces to enhance their anti-fouling performance. However, the coatings face the challenge of low adhesion strength due to the complex deposition conditions. To address this issue, gradient Ni-P-PTFE coatings with varying concentrations of PTFE emulsion were fabricated on stainless steels, and non-gradient Ni-P-PTFE coatings were also synthesized for comparison purposes. The surface morphology, cross-sectional morphology, and element distribution in the vertical direction were characterized using Scanning Electron Microscopy (SEM) and Energy-Dispersive Spectroscopy (EDS). X-ray Diffraction (XRD) was employed to examine the microstructure of the coatings. Nanoindentation was conducted to evaluate hardness and elastic modulus, while a friction and wear tester was used to measure the coefficient of friction. A coating adhesion scratch tester was utilized for testing the adhesion strength, whereas a contact angle tester determined wetting property characteristics. The results demonstrate that an increase in PTFE emulsion content leads to a reduction in the hardness and elastic modulus of Ni-P-PTFE coatings while gradually enhancing their hydrophobicity. The overall performance of gradient coatings surpasses that of non-gradient coatings. Notably, when the PTFE concentration reaches (25 + 50) mL/L, the gradient coatings exhibit uniform particle distribution, superior friction and wear resistance, and the bonding strength is enhanced. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00406090
- Volume :
- 799
- Database :
- Academic Search Index
- Journal :
- Thin Solid Films
- Publication Type :
- Academic Journal
- Accession number :
- 177878027
- Full Text :
- https://doi.org/10.1016/j.tsf.2024.140397