Preparation of a self-developed chrome-free colored coating based on a titanium conversion coating on 6063 Al alloy

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62045-62051 ◽  
Author(s):  
Caixia Zhang ◽  
Yuyu Jia ◽  
Xin Zhong ◽  
Xiaosong Wu ◽  
Yali Liu
Keyword(s):  
Mannich Base ◽  
Conversion Coating ◽  
Al Alloy ◽  
Conversion Coatings ◽  
Chromate Conversion Coatings ◽  
6063 Al Alloy ◽  
Colored Coating

A new conversion coating improved via the combination of a self-developed Mannich base and hexafluorotitanic acid has been studied and compared with chromate conversion coatings and coatings without the Mannich base.

Zirconate Conversion Coatings on Al Alloy by Electrochemical Method

2012 ◽  
Vol 460 ◽  
pp. 86-89
Author(s):  
Qi Zhou ◽  
Hong Yan Liu ◽  
Xiu Lian Cheng ◽  
Guang Sen Zhang
Keyword(s):  
Corrosion Resistance ◽  
Paint Film ◽  
Chemical Conversion ◽  
First Grade ◽  
Conversion Coating ◽  
Complexing Agents ◽  
Complexing Agent ◽  
Al Alloy ◽  
Conversion Coatings ◽  
Electrochemical Conversion

Chromium-free conversion coatings were generated to replace chromate chemical process by electrolysis treatment LY12 aluminum alloy in zirconate solution. Film thickness, dropping test, the adhesion between aluminum and paint film were tested for single-factor experiments and orthogonal to seek better electrolysis process. The paint adhesion is the first grade for electrochemical conversion solution containing complexing agents, or it is the second grade without complexing agents. When DNS complexing agent is 2 ~ 5g/L, film corrosion resistance rises with the increasing content of complexing agent. If voltage is too low, corrosion resistance of conversion coating is poor; voltage is too high, the films form powders. Better formulations for zirconate conversion coating are: 5g/L DNS complexing agent, 10V voltage, treatment temperature is 40°C. Electrochemical conversion coating is thinner than chemical conversion, but the corrosion resistance is better because the electrochemical conversion coatings are smoother and compacter than the chemical conversion coating. The paint films on electrochemical conversion coating are smoother than the chemical one. Two kinds of conversion coatings have very good adhesion with paint film up to the first level. Electrochemical conversion coatings thickness is 2.5 μm, bubble time of NaOH-glycerine solution on them is up to 92s.

Chromate Conversion Coatings on 2024 Al Alloy

1997 ◽  
Vol 25 (4) ◽  
pp. 223-234 ◽  
Author(s):  
A. E. Hughes ◽  
R. J. Taylor ◽  
B. R. W. Hinton
Keyword(s):  
Al Alloy ◽  
Conversion Coatings ◽  
Chromate Conversion Coatings

Preparing an Environment-Benignly Rare-Earth Based Chemical Conversion Coatings on 6063 Aluminium Alloy

2008 ◽  
Vol 373-374 ◽  
pp. 224-227 ◽  
Author(s):  
Dong Chu Chen ◽  
Gui Xiang Wu ◽  
Wen Fang Li ◽  
Wen Hui Gong ◽  
Yi Qing Liang
Keyword(s):  
Rare Earth ◽  
Orthogonal Experiment ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Solution Temperature ◽  
Al Alloy ◽  
Treatment Technology ◽  
Structure Morphology ◽  
6063 Al Alloy ◽  
Coating Formation

In order to develop an environment-benignly chemical conversion process to substitute the toxic hexavalent chromium treatment on Al alloy surface, a new surface treatment technology based on rare-earth element, which is to form chemical conversion coating on 6063 Al alloy was presented. In this process, Ce(NO3)3 was adopted in the chrome-free preparing solution, and KMnO4 was used as oxidant to accelerate the coating formation on 6063 Al alloy. Furthermore, an L16(43) orthogonal experiment was carried out to examine the effect of Ce(NO3)3, KMnO4 and solution temperature on the coating growth on 6063 Al alloy. Accelerants of SrCl2 and NH4VO3 were added to the preparing solution to improve the coating performance. XRD, SEM and EDS were used to analyse the coating surface structure, morphology and composition. It was found that a good anti-corrosion coating which is mainly composed of the elements of Al, Ce, O, Mn, Mg could be formed in the optimal preparing solution of 5g/L Ce(NO3)3 , 4g/L KMnO4, 1.4g/L SrCl2 at the temperature of 20°C.

A Zr- and Cr(III)-containing conversion coating on Al alloy 2024-T3 and its self-repairing behavior

2016 ◽  
Vol 68 (3) ◽  
pp. 338-346 ◽  
Author(s):  
C. Cai ◽  
X.-Q. Liu ◽  
X. Tan ◽  
G.-D. Li ◽  
H. Wang ◽  
...  
Keyword(s):  
Conversion Coating ◽  
Al Alloy

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.

Growth of permanganate conversion coating on 2024-Al alloy

2007 ◽  
Vol 515 (23) ◽  
pp. 8386-8392 ◽  
Author(s):  
S.A. Kulinich ◽  
A.S. Akhtar ◽  
P.C. Wong ◽  
K.C. Wong ◽  
K.A.R. Mitchell
Keyword(s):  
Conversion Coating ◽  
Al Alloy
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