Effect of Hydrogen Peroxide Concentration on Corrosion Resistance of Cerium-Based Conversion Coatings on Mg AZ91D Alloy

2019 ◽  
Vol 41 (15) ◽  
pp. 13-26 ◽  
Author(s):  
Surender Maddela ◽  
Matthew J. O'Keefe ◽  
Yar-Ming Wang
Keyword(s):  
Hydrogen Peroxide ◽  
Corrosion Resistance ◽  
Az91d Alloy ◽  
Conversion Coatings

Properties of Conversion Coating of Magnesium Alloys by a Phosphate-Permanganate Solution

2005 ◽  
Vol 488-489 ◽  
pp. 665-668 ◽  
Author(s):  
Shu Sen Wu ◽  
Ming Zhao ◽  
Ji Rong Luo ◽  
You Wu Mao
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloys ◽  
Adhesion Force ◽  
Conversion Coating ◽  
Resistance Test ◽  
Az91d Alloy ◽  
Conversion Coatings ◽  
Good Adhesion ◽  
Better Than

A chromium-free conversion coating for AZ91D magnesium alloys has been obtained by using a phosphate-permanganate solution. Examinations have been carried out on the conversion coating for morphology, composition, adhesion force and corrosion resistance. Results show that the conversion coatings are relatively uniform and continuous, with thickness from 7µm to 10µm. They exhibit good adhesion to matrix and have some non-penetrate tiny holes on the surface. The main elements of the conversion coating of AZ91D alloy are Mg、O、P、K、Al、Mn. Results of corrosion resistance test indicate that the corrosion resistance of the conversion coating by phosphate-permanganate solution is in match to that of the conversion coating formed in a chromate solution, but for the corrosion resistance after painting, the former is better than the later.

Synthesis and evaluation of corrosion resistance of molybdate-based conversion coatings on electroplated zinc

2010 ◽  
Vol 205 (7) ◽  
pp. 2328-2334 ◽  
Author(s):  
Dian-long Liu ◽  
Zhi-gang Yang ◽  
Zhen-qiang Wang ◽  
Chi Zhang
Keyword(s):  
Corrosion Resistance ◽  
Conversion Coatings

scholarly journals Effect of Temperature on Corrosion Resistance of Layered Double Hydroxides Conversion Coatings on Magnesium Alloys Based on a Closed-Cycle System

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1658
Author(s):  
Xiaochen Zhang ◽  
Zhijuan Yin ◽  
Bateer Buhe ◽  
Jiajie Wang ◽  
Lin Mao ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Photoelectron Spectroscopy ◽  
Conversion Coating ◽  
Effect Of Temperature ◽  
Conversion Coatings ◽  
Closed Cycle ◽  
Cycle System ◽  
Double Hydroxide ◽  
Double Hydroxides

The effect of temperature on the corrosion resistance of layered double hydroxide (LDH) conversion coatings on AZ91D magnesium alloy, based on a closed-cycle system, was investigated. Scanning electron microscopy (SEM), photoelectron spectroscopy (XPS), and X-ray diffractometry (GAXRD) were used to study the surface morphology, chemical composition, and phase composition of the conversion coating. The corrosion resistance of the LDH conversion coating was determined through electropotentiometric polarisation curve and hydrogen evolution and immersion tests. The results showed that the conversion coating has the highest density and a more uniform, complete, and effective corrosion resistance at 50 °C. The chemical composition of the LDH conversion coating mainly comprises C, O, Mg, and Al, and the main phase is Mg6Al2(OH)16CO3·4H2O.

Melatonin as an Accelerating Agent for Phosphate Chemical Conversion Coatings on Mild Steel with Enhanced Corrosion Resistance

2020 ◽  
Vol 167 (10) ◽  
pp. 101505
Author(s):  
Yuqin Tian ◽  
Weijun Qiu ◽  
Yuhui Xie ◽  
Haowei Huang ◽  
Jin Hu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Chemical Conversion ◽  
Conversion Coatings
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