Behavior and interaction of boundary lubricating additives on steel and DLC-coated steel surfaces

In this study, a superhydrophobic coating on steel surface has been developed with polyurethane, SiO 2 nanoparticles and hexadecyltrimethoxysilane by using a spin-coating technique. Characterization of the coated steel surface was done by using the contact angle measurement technique, scanning electron microscopy and Fourier transform infrared spectroscopy. With a water tilt angle of 4° ± 2° and static contact angle of 165° ± 5°, the coated surface shows a superhydrophobic and self-cleaning nature. Chemical, thermal, mechanical stability tests and droplet dynamic studies were done to evaluate performance of the coating. Excellent self-cleaning, anti-fogging and anti-corrosion properties of coated steel surfaces make them ideal for industrial applications. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology (part 3)’.

Download Full-text

Influence of Water Absorption on Static Friction of Pure and Friction-Modified PA6 Polymers

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.799.59 ◽

2019 ◽

Vol 799 ◽

pp. 59-64

Author(s):

Igor Velkavrh ◽

Stefan Klien ◽

Joel Voyer ◽

Florian Ausserer ◽

Alexander Diem

Keyword(s):

Water Absorption ◽

Static Friction ◽

Polyamide 6 ◽

Coated Steel ◽

Friction Modifiers ◽

Test Conditions ◽

Influence Of Water ◽

Steel Surfaces ◽

Contact Pressures ◽

Lubrication Conditions

In the present study, static coefficients of friction of pure and friction modified (FM) polyamide 6 (PA6) polymers against primer-coated steel surfaces were investigated under a series of nominal contact pressures and by considering the influences of water absorption by the polymer, temperature, counter-body surface roughness and lubrication conditions. Under the majority of the test conditions investigated, FM PA6 exhibited lower static friction than pure PA6. Under unlubricated conditions, this was due to the low adhesion of the FM PA6 provided by its friction modifying inclusions; while under lubricated conditions, a combination of softening due to water absorption and decreased adhesion provided by its friction modifiers enabled lower static friction, especially at medium and high contact pressures.

Download Full-text

Delaying Frost Formation by Controlling Surface Chemistry of Carbon Nanotube-Coated Steel Surfaces

ACS Applied Materials & Interfaces ◽

10.1021/acsami.6b11531 ◽

2017 ◽

Vol 9 (7) ◽

pp. 6512-6519 ◽

Cited By ~ 21

Author(s):

Yu Zhang ◽

Mena R. Klittich ◽

Min Gao ◽

Ali Dhinojwala

Keyword(s):

Carbon Nanotube ◽

Surface Chemistry ◽

Coated Steel ◽

Frost Formation ◽

Steel Surfaces

Download Full-text

Surface stresses in coated steel surfaces—influence of a bond layer on surface fracture

Tribology International ◽

10.1016/j.triboint.2008.04.013 ◽

2009 ◽

Vol 42 (1) ◽

pp. 137-148 ◽

Cited By ~ 18

Author(s):

Kenneth Holmberg ◽

Anssi Laukkanen ◽

Helena Ronkainen ◽

Kim Wallin

Keyword(s):

Coated Steel ◽

Surface Fracture ◽

Surface Stresses ◽

Bond Layer ◽

Steel Surfaces

Download Full-text

Tribological performances of ZDDP and ashless triphenyl phosphorothionate (TPPT) as lubricant additives on Ti–N and Ti–Al–N coated steel surfaces

Tribology - Materials Surfaces & Interfaces ◽

10.1179/1751584x14y.0000000079 ◽

2014 ◽

Vol 8 (4) ◽

pp. 209-221 ◽

Cited By ~ 2

Author(s):

E. Ng ◽

C. Lim ◽

S. K. Sinha ◽

N. Satyanarayana ◽

Z. Zhang

Keyword(s):

Lubricant Additives ◽

Coated Steel ◽

Steel Surfaces

Download Full-text

Protection of Mg Alloys against Galvanic and Other Forms of Corrosion

Materials Science Forum ◽

10.4028/www.scientific.net/msf.488-489.787 ◽

2005 ◽

Vol 488-489 ◽

pp. 787-792

Author(s):

Wen Yue Zheng ◽

C. Derushie ◽

Jason Lo

Keyword(s):

Galvanic Corrosion ◽

Research Work ◽

Cost Effective ◽

Mg Alloys ◽

General Corrosion ◽

Coated Steel ◽

Powder Coat ◽

Steel Surfaces ◽

Important Form ◽

Electrolytic Resistance

Galvanic corrosion is a particularly important form of corrosion for Mg alloys used in automobiles. Our research work focuses on corrosion protection using cost-effective Cr-free coatings. The top-tanking coatings are found to be effective in preventing general corrosion; some of these coatings are also good for reducing galvanic corrosion and stress corrosion. A practical approach for mitigating galvanic corrosion is to increase the electrolytic resistance between the coated steel and the Mg surfaces. This has been demonstrated in the case of a conversion coating plus a powder coat applied on the surface of a magnesium alloy and in the case of a thin Mylar isolation layer installed between the Mg and the steel surfaces.

Download Full-text