Effect of Chemical Conversion Induced by Self-corrosion of Zinc Powders on Enhancing Corrosion Protection Performance of Zinc-rich Coatings

2021 ◽  
pp. 109942
Author(s):  
Qian Ma ◽  
Lida Wang ◽  
Wen Sun ◽  
Zhengqing Yang ◽  
Suilin Wang ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Chemical Conversion ◽  
Zinc Powders

Epigallocatechin gallate (EGCG) induced chemical conversion coatings for corrosion protection of biomedical MgZnMn alloys

2015 ◽  
Vol 94 ◽  
pp. 305-315 ◽  
Author(s):  
Hao Zhang ◽  
Rifang Luo ◽  
Wenjun Li ◽  
Juan Wang ◽  
Manfred F. Maitz ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Epigallocatechin Gallate ◽  
Chemical Conversion ◽  
Conversion Coatings

IMMERSION AND ELECTROCHEMICAL TESTS STUDY ON CORROSION RESISTANCE OF CHROME-FREE CHEMICAL CONVERSION FILM ON AZ91D Mg ALLOY IN 5 wt% NaCl SOLUTION

2005 ◽  
Vol 12 (03) ◽  
pp. 417-424
Author(s):  
X. P. ZHANG ◽  
G. CHEN
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Chemical Conversion ◽  
Alloy Coating ◽  
Charge Transfer Resistance ◽  
Mg Alloy ◽  
Nacl Solution ◽  
Transfer Resistance ◽  
Electrochemical Tests

Immersion and electrochemical tests have been applied to study corrosion protection of AZ91D Mg alloy coating with chrome-free chemical conversion (CCC) coat in 5wt% NaCl solution. The immersions tests include weight-loss measurements after full or partial immersion with whole coating and full immersion with damaged coating. The electrochemical tests include electrochemical impedance spectroscopy (EIS) and polarization curves measurement. The results of immersion and electrochemical tests show that chrome-free chemical conversion (CCC) surface treatment can significantly improve the corrosion resistance of AZ91D Mg alloy in 5% NaCl solution, and that the corrosion protection effect of CCC coating is not sensitive to pores or cracks. The equivalent circuit models are fitted from Nyquist plots for the uncoated specimens and the CCC-coated specimens. The charge transfer resistance, R ct , increases from about 1.669 Ω cm2 for the uncoated alloy to about 210 Ω cm2 after the alloy is coated with CCC coating.

CVD mullite and mullite-alumina corrosion protection coatings for silicon based ceramics

2001 ◽  
Vol 11 (PR3) ◽  
pp. Pr3-861-Pr3-867 ◽  
Author(s):  
S. M. Zemskova ◽  
J. A. Haynes ◽  
K. M. Cooley
Keyword(s):  
Corrosion Protection ◽  
Silicon Based
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