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| Comparative Analysis on Corrosion Rule of Electrodeposited Zn-Ni Alloy and Hot Diffusion Zinc Coatings in Tropical Marine Atmospheric Environment |
| Received:October 26, 2022 Revised:December 05, 2022 |
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| DOI：10.7643/issn.1672-9242.2023.07.016 |
| KeyWord:electrodeposited Zn-Ni alloy hot diffusion zinc island reef tropical marine atmosphere corrosion rule corrosion resistance |
| Author | Institution |
| GUO Qiang |
Beijing Institute of Machinery and Equipment, Beijing , China |
| BAI Peng-ying |
Beijing Institute of Machinery and Equipment, Beijing , China |
| MENG Qing-bao |
Beijing Specialized Machinery Institute, Beijing , China |
| ZHAO Yong-tao |
Troop 92228 of PLA, Beijing , China |
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| Abstract: |
| The work aims to solve high susceptibility to corrosion damage or failure of metal coatings on steel in tropicad marine atmospheric environment, and select the metal coatings with high corrosion resistance in a tropical marine atmospheric environment to improve the service life of steel parts. The outdoor exposure test was carried out in certain island reef, and the corrosion rule of electrodeposited Zn-Ni alloy and hot diffusion zinc coatings was studied. By the means of scanning electron microscope, energy diffraction spectrum (EDS), optical microscope, and adherence force tester, the surface morphology, chemical composition, section morphology, thickness and adherent force of the two coatings were observed and tested. The electrodeposited Zn-Ni alloy coating showed main corrosion form including selective corrosion and pitting corrosion, and better corrosion resistance within 720 d. Hot diffusion zinc coating showed main form of general corrosion, the micro-crack in the coating promoted corrosion rate and within 90 d, the substrate showed no corrosion, and the coating corrosion rate was faster within 360 d ~ 720 d. Between the two kinds of metal coatings used on the steel, the electrodeposited Zn-Ni alloy coating shows much better corrosion resistance than the hot diffusion zinc coating. Compared with the hot diffusion zinc coating, the electrodeposited Zn-Ni alloy coating on steel is much better suitable for long time service in the marine atmospheric environment. |
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