Appearance of Mechanical Zinc Coatings and Superficial Pore Sealing Treatment

Ding, Jin Cheng; Zhao, Zeng Dian; Lu, Jie; Sun, Yun Quan

doi:10.4028/www.scientific.net/KEM.373-374.750

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Appearance of Mechanical Zinc Coatings and Superficial Pore Sealing Treatment
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Home Key Engineering Materials Surface EngineeringAppearance of Mechanical Zinc Coatings and...

Appearance of Mechanical Zinc Coatings and Superficial Pore Sealing Treatment

Abstract:

By using SnSO4 water solution to activate global granular Zn powders of 325 screen mesh, Zn-Sn composite coverage is formed under the action of mechanical impact of the tiny glass beads and work pieces. During and after the formation of coating, acid water liquor will react with metal basal body, and hydrogen gas is bound to emit from the pathway and form micro pores. In addition, there are bond areas between the new and the primary coverage, which may lead to the emergence of micro crack on the coating owing to such causes as too big or uneven impact during plating process, little distortion of global granular zinc dust inside the plating coat, less tight coalescent of the zinc dust flecks. These problems can be confirmed by SEM scanning coating surface and cross section pictures of plating coat. In our study, methyl hydrogen silicone fluid, titanium isopropoxide and benzinum are used as the basal components. This compound has such features as better osmosis for micro pores and cracks formed in the process of dual coverage, strong adhesive force, anti-contraction, high transparence and water proof property. The impact of titanium isopropoxide dosage on the solidifying speed of methyl hydrogen silicone fluid, and that of mechanical plating zinc coating on corrosion proof are studied. Through tests, the proper compound ratio is determined as 11:10:79 of methyl hydrogen silicone fluid to titanium isopropoxide to benzinum(90-120 Centigrade degree). Experiments indicate that when the coating thickness is 0.2 micron, the emergence time of white corrosion on the plating coat doubles, accordingly, that of red rust prolongs, this shows that the anticorrosion of the coverage can be significantly improved through superficial pore sealing in zinc plating coat.

Info:

Periodical:

Key Engineering Materials (Volumes 373-374)

Main Theme:

Surface Engineering

Edited by:

M.K. Lei, X.P. Zhu, K.W. Xu and B.S. Xu

Pages:

750-753

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.373-374.750

Citation:

J. C. Ding et al., "Appearance of Mechanical Zinc Coatings and Superficial Pore Sealing Treatment", Key Engineering Materials, Vols. 373-374, pp. 750-753, 2008

Online since:

March 2008

Authors:

Jin Cheng Ding, Zeng Dian Zhao, Jie Lu, Yun Quan Sun

Keywords:

Benzinum, Mechanical Plating Zinc Coating, Methyl Hydrogen Silicone Fluid, Solidifying Reaction, Titanium Isopropoxide

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Price:

$38.00

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References

[1] ASTM B695-1985，Standard Specification for Coatings of Zinc Mechanical Deposited on Iron and Steel.

[2] Zeng Dian Zhao, Xian Jin Yu and Jin Cheng Ding: Heat Treatment of Metals, Vol. 31(2006), p.21.

[3] Jie Lu, Jin Cheng Ding: Mater. Pro., Vol. 36(2003), p.60.

[4] Jin Cheng Ding, Yu Sui Bi and Zeng Dian Zhao: Corrosion Sci. and Pro. Tech., Vol. 14(2002), p.61.

[5] Jin Cheng Ding, Zeng Dian Zhao and Yi Min Lv: Foshan Ceramics, Vol. 16(2006), p.21.

[6] Jin Cheng Ding, Zeng Dian Zhao and Yi Min Lv: Jiangsu Ceramics, Vol. 39(2006), p.27.

Paper TitlePages

Effect of Bond Coat Diffusion on Adhesion Behaviour of Hard Alloy Powder NiCrBCSi (Fe) Coatings Thermally Sprayed on 60CrMn4 Steel

Authors: S. Abdi, B. Malki, S. Lebaili

Abstract: The object of the present work is to study the spraying of poly-powders nickel bases containing Cr, Si, C and B elements addition with variable percentage of iron, deposited on a steel substrate by oxy fuel thermal spraying. The substrate surface was previously treated by Al–Ni bond coat and post–annealing at 650°C. The spraying powder and coating micro structure were investigated by combination of X-ray diffraction, electron microprobe and scanning electron microscope coupled to an analyzer energy dispersive x-ray. The adherence to substrate was determined by using shear test for adhesion. The result of this study was to investigate to compare potentials of HVOF sprayed NiCrBCSi and satellite 6 coating for a possible to replacement of hard chromium plating. A good adherence of coating NiCrBCSi (Fe) on steel substrate is explained by formation of large diffusion zone in interface after annealing and by the nature of the structure deposit duplexes.

Effect of Plasma Interface Treatment and Cathodic Electrophoretic Coating on Mg Alloys

Authors: Jin Zhang, Ren Yu Li, Qing Song Yu

Abstract: In this study, plasma treatment using Ar and H2 and plasma polymerization with trimethylsilane (TMS), were carried out to create the interface film systems with a structure of Mg/plasma interlayer/cathodic electrophoretic coating (E-coat) for a magnesium (Mg) alloy AZ31B. The interface adhesion of the coating system was evaluated using N-methylpyrrolidinone (NMP) paint removal test and ASTM tape test conducted under dry and wet conditions. Plasma TMS film could stick the Mg substrate more strongly than E-coat.The surface of samples with different interlayer treatment after NMP test has been observed by SEM. The potentiodynamic study performed on the E-coated samples showed a noticeable reduction of corrosion current, three orders of magnitude less than bare Mg. Salt spray test also was done to confirm the resistance corrosion of E-coat. It was found that plasma interface treatment has the ability of increasing the adhesion of E-coat on Mg alloy more or less, thus restrict access to damaging species that exist in Cl- aqueous environments.

984

Appearance of the Mechanical Plating Formed by Zn-Al Compounding Flake Powders and its Anticorrosion

Authors: Jie Lu

Abstract: In this study, a comparison of appearance surface and fracture surface of mechanical plating was made, respectively formed by spherical Zn powders and Zn-Al compounding flake powders. It is found that the spherical particles are deposited and embedded on Zn plating. The deformation of granular Zn powders on coating superficial is relatively large, but there is little distortion of globe grain inside the coating, mainly with spheroidicity distorted. Besides, there are obvious gaps between the particles in Zn coating. In contrast, the flake structure granules of Zn-Al plating are densely and compactly laid out with small space. After contacting with air, the plating coat expands owing to aluminum oxidation, leading to the higher position of the plating coat on the cross section than the matrix metal. We then did salt mist test to verify the corrosion resistance of Zn-Al compounding flake coating. It was found that the Zn-Al compounding flake coating was superior to that formed by globe Zn powder. Results show that the addition of layers of flakes has a better shielding action resisting corrosive medium, leading to the decrease of the osmosis from corrosive medium to the coatings. And the coating can repair naturally after being damaged. We further passivate plating with molybdate to improve the anticorrosion of the coating.

811

Surface Roughness Characteristics and Structure of Steel C45 after WC-Co Coating and Laser Treatment

Authors: Katarina Monkova, Peter Monka

Abstract: The article deals with the influence of the laser melting process on the surface roughness characteristics of the coat deposited on material by electrospark way granted by KEGA 035TUKE-4/2011 project of Ministry of education of Slovak republic. The aim of the article is research of material properties after coating by WC-Co and laser treatment. As the research method were used experiments and tools of statistics. Experiments were carried out on WC-Co coat (the anode), which was deposited on C45 carbon steel (the cathode) and molten by a laser beam. After surface treatment were analysed of changes in surface structure of the coat. Results of the research shows influence of parameters of this process to roughness, tribologic properties and morphology of the surface layer prepared by WC-Co coating and laser treatment.

370

High-Temperature Corrosion of NiCrAlY/YSZ Coatings in Ar-1%SO₂ Gas

Authors: Poonam Yadav, Muhammad Ali Abro, Dong Bok Lee

Abstract: The thermal barrier coating that consisted of ZrO₂-8Y₂O₃ top-coat and Ni-22Cr-10Al-1Y bond-coat corroded in Ar-1%SO₂ gas at 1000-1200°C for up to 300 h. The top-coat and bond-coat consisted primarily of β-ZrO₂ and (γ-Ni, α-Al₂O₃), respectively. During corrosion, Al oxidized preferentially to α-Al₂O₃ to protect TBC, and sulfidation occurred to a small extent.