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Study on the Technology of Zn-Ni/Nano-Al2O3 Alloy Coating Electrodeposition

Author: HeFangBo
Tutor: ChenBin
School: Xi'an University of Architecture and Technology
Course: Applied Chemistry
Keywords: Electrodeposition Composite coating Nano- Al2O3 particles Corrosion resistance Corrosion mechanism
CLC: TG174.41
Type: Master's thesis
Year: 2009
Downloads: 113
Quote: 1
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Abstract


Metal corrosion to bring huge economic losses and social harm. The traditional zinc coating is widely used to prevent corrosion of steel and economic means. For this reason, science and technology workers to take a series of measures, which is one of the more effective ways galvanized base alloy, but need to passivation treatment in order to get a more excellent corrosion resistance coating. In this context, the subject developed a Zn-Ni / nano-Al 2 O 3 composite coating preparation process, without passivation treatment, you can get more excellent corrosion resistance of the coating. Not only simplifies the process and reduces costs, and reduce the environmental pollution. This test uses a single factor experiment investigated composite coatings of various factors on the impact of its ingredients. On this basis, the use of Shanghai Chen Hua CHI832 electrochemical analyzer, the company D/max-2400 Rigaku X-ray diffractometer and the Netherlands FEI Company QUANTA200 scanning electron microscopy and other methods of Zn-Ni / nano-Al < sub> 2 O 3 composite coating cathodic polarization, composition, structure and morphology of the corrosion products were analyzed and studied. Etching using dilute acid and neutral salt spray test method for Zn-Ni / nano-Al 2 O 3 composite coatings was analyzed. The results showed that: (1) bath optimum formulations and processes as: zinc oxide (ZnO) 20g · L -1 ; ammonium chloride (NH 4 Cl) 200 g · L -1 ; nickel chloride (NiCl 2 · 6H 2 O) 40 g · L -1 ; boric acid (H 3 BO 3 ) 20 g · L -1 ; nano Al 2 O 3 25g · L -1 ; saccharin 1.5 g · L -1 ; sodium lauryl sulfate 1.5 g · L -1 ; additive amount; pH 6.0; plating time 120min; current density D k 4A · dm -2 ; temperature 50 ℃; stirring speed 200rpm. (2) to use the bath formulation and process conditions can be obtained Ni and Al 2 O 3 content of about 13%, and 0.40% 0 .60%, with good corrosion resistance and appearance of the Zn-Ni / nano-Al 2 O 3 composite coating. (3) in the stronger medium corrosion, the coating of metal components on the corrosion rate of the more obvious; weak corrosive medium in Vietnam, the coating Al 2 O 3 particles reduce the corrosion rate effect is more obvious. (4) plating the Al 2 O 3 particles embedded in the coating machine, because Al 2 O 3 particle itself chemically inert, particulate mechanical shielding effect of the coating metal in contact with the medium surface area reduced, thereby improving the oxidation resistance of the coating, and when the composite coating containing Ni 13% or so of the Zn-Ni / nano-Al 2 O 3 composite coating composition than a single phase, there will be very little corrosion microcells generated. (4) in the coating was salt water corrosion, Al 2 O 3 and the coating particles were Zn and Ni salt forming compound in the coating corrosion products and covers the surface, from the to slow down the corrosion. (5) Al 2 O 3 after the coating particles are incorporated, so that more detailed crystalline coating, more uniform grain arrangement, neat, reducing the porosity of the coating, thereby greatly reduced matrix direct chemical corrosion and electrochemical corrosion possibilities.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Electrochemical protection
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