Study on Preparation of Superhydrophobic Ni-Co Coating and Corrosion Resistance by Sandblasting–Electrodeposition

Abstract

To enhance the corrosion resistance of type C45E4 substrates, a superhydrophobic Ni-Co coating was prepared on a C45E4 surface by sandblasting pretreatment and electrodeposition. The surface microstructure, three-dimensional surface roughness, and crystal structure of the coating was characterized by scanning electron microscope, laser scanning confocal microscope, and X-ray diffraction. An optical surface contact angle measuring instrument and an electrochemical workstation was used to characterize the wettability and corrosion resistance of the surface. The results showed that the water contact angle reached 151.2 degrees on the Ni-Co coating surface. The surface was superhydrophobic and still had stable hydrophobicity after four months. In electrochemical corrosion experiments. Compared with polishing pretreatment, the corrosion current density of superhydrophobic Ni-Co coating prepared by sandblasting pretreatment reached Icorr = 5.05 × 10−7 A·cm−2, and the corrosion potential reached Ecorr = −0.33 V. The superhydrophobic Ni-Co coating had excellent corrosion resistance.

Effect of Grit Blasting and Polishing Pretreatments on the Microhardness, Adhesion and Corrosion Properties of Electrodeposited Ni-W/SiC Nanocomposite Coatings on 45 Steel Substrate

“…From the Figure 4a and the Figure 5a, it can be seen that a large number of random deformations in the form of bulges, flat, and pits were observed on the surface of the grit blasted specimen while the polished surface was flat and smooth with no scratches. Similar result were reported in the previous studies [29,30]. Ni-W coating pretreated by polishing exhibited a less obvious nodular structure on the surface of the morphology which can be attributed to a lower surface roughness of the 45 steel substrates.…”

“…Similar results are found by Fu et al and Zhang et al [27,30]. Compared with the base substrate, it was found that the corrosion potential of the Ni-W coating was significantly greater than that of the substrate.…”

Influence of Particle Concentration on the Elemental Penetration Region and Properties of Ni-P-SiC Composite Coatings Prepared through Sandblasting and Scanning Electrodeposition on 45 Steel Surfaces

“…The main composition of 45 steel is Fe (elemental iron), and the composition of the remaining minor elements is shown in Table 1. Prior to sandblasting pretreatment for the surface of the 45 steel substrate, a metallographic specimen grinding and polishing machine was used for polishing and #320, #800, and #1500 water sandpaper for mechanical grinding and polishing [23]. Sandblasting pretreatment parameters are shown in Table 2.…”

“…Sandblasting is the most common pretreatment method for metal substrates in the industrial sector. This simple, efficient, and low-cost process uses compressed air to form a high-speed jet beam to spray sand particles at high speed onto the substrate surface to deform it plastically, thereby enhancing the mechanical properties and accelerating the deposition rate of the coating [20][21][22][23][24]. Most studies on electrodeposited composite coatings focused on surface characterization and performance testing such as the influence of microscopic morphology [25,26], grain structure [27,28], and element distribution [29,30] on corrosion resistance.…”

A General Strategy towards Superhydrophobic Self-Cleaning and Anti-Corrosion Metallic Surfaces: An Example with Aluminum Alloy

“…Inspired by the lotus effect, a superhydrophobic surface with a water contact angle (CA) more than 150 • and a sliding angle (SA) less than 10 • has attached great interest in both academic research and practical applications owing to its unique properties, involving water-repellency [15][16][17][18], self-cleaning [19][20][21], corrosion resistance [22][23][24][25][26][27][28], antiicing [29,30], oil-water separation [31,32] and drag reduction [33]. Such surface can be realized through the synergistic effect of two main factors: modification with low-surfaceenergy materials and creation of a certain type of hierarchal micro-nanostructure.…”