Structure and Corrosion Resistance of Tin Salt Conversion Coating on Aluminum Alloy

2010 ◽  
Vol 129-131 ◽  
pp. 467-471
Author(s):  
Yan Bo Wu ◽  
Si Si Zeng ◽  
Peng Sun
Keyword(s):  
Corrosion Resistance ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
Uncoated Sample ◽  
X Ray ◽  
Coating Composition ◽  
Chemical Conversion Coating ◽  
Better Than

A chrome-free chemical conversion coating was prepared using stannous sulfate as the main salt. The morphology of the chemical conversion surface layer was observed by scanning electron microscopy (SEM). Coating composition and the microcosmic phase structure were characterized using energy dispersive X-ray (EDX) analysis and X-ray diffraction (XRD) respectively. Electrochemical method and dropping test were used to study the coatings corrosion resistance. The results indicated that the tin salts conversion coating is a crystal structure material that composites with Sn-F-O-Al et al., the surface appears as a accumulation of spherical particles, the crystallinity of conversion coating is better than uncoated sample obviously, the corrosion resistance has improved too.

Technical and Performance Study of Ti-W Composite Chemical Conversion Coating on Aluminum Alloy

2010 ◽  
Vol 129-131 ◽  
pp. 819-823
Author(s):  
Yan Bo Wu ◽  
Si Si Zeng ◽  
Peng Sun
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Orthogonal Experiment ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Spherical Particles ◽  
Performance Study ◽  
Uncoated Sample ◽  
X Ray ◽  
Chemical Conversion Coating

Ti-W composite coating was made by chemical conversion method on aluminum alloy. By orthogonal experiment, the optimal coating-forming conditions were the concentration ratio of TiOSO4 and Na2WO4 was 0.3 g/L:0.3 g/L、KMnO4 1.0 g/L、NaF 1.0 g/L、reaction temperature 40°C、reaction time 2min. The morphology of the coating was observed by scanning electron microscopy (SEM). Coating composition and the microcosmic phase structure were characterized using energy dispersive X-ray (EDX) analysis and X-ray diffraction (XRD) respectively. Electrochemical test was used to study the coatings corrosion resistance. The results indicated that the composite chemical conversion coating is a crystal structure material that composites with Al、Mn、W、Ti et al., its surface appears as a accumulation of fibroid spherical particles, the crystallinity of conversion coating is better than uncoated sample obviously. The corrosion potential of the coating is improved to -0.440V, they were both prove the corrosion resistance has improved.

Comparison of Two Different Chemical Conversion Coating on Aluminum Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 208-211
Author(s):  
Yan Bo Wu ◽  
Si Si Zeng ◽  
Peng Sun
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Electrochemical Method ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Conversion Coatings ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
X Ray ◽  
Chemical Conversion Coating

In this paper, we made two different chemical conversion coatings on aluminum alloy by TiOSO4 and Na2WO4. The morphology of the chemical conversion surface layers were observed by scanning electron microscopy (SEM). The microcosmic phase structures were characterized using X-ray diffraction (XRD). Electrochemical method was used to study the coatings corrosion resistance. The results indicated that the two conversion coatings were crystal structure material, the surface of coating were both show pothole structure. TiOSO4 coating have better corrosion resistance than Na2WO4 coating.

Formation and Properties of Zr/Ti Based Nano-Sized Non-Chromium Chemical Conversion Coating on AA 5083

2019 ◽  
Vol 19 (6) ◽  
pp. 3487-3494 ◽  
Author(s):  
Bin Liu ◽  
Yi Zhao ◽  
Liang Li ◽  
Yafei Feng ◽  
Zhigang Fang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Acidic Solution ◽  
Salt Spray ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Dense Layer ◽  
Environment Friendly ◽  
Chemical Conversion Coating ◽  
Inhibitive Action ◽  
Nano Size

An environment-friendly non-chromium chemical conversion coating was obtained from fluozirconate/fluotitanate acidic solution for the corrosion protection of AA 5083. The surface morphology, composition, electrochemical behavior and corrosion resistance of this coating were investigated. The coating was found to be a homogeneous and dense layer consisting of nano-size particles, of which the major component was compound oxides consisted by Al, Mg, Zr, Ti, F and O. The results of electrochemical measurements, immersion and natural salt spray (NSS) tests demonstrated that the corrosion resistance of the AA 5083 H-116 was improved by the nano-sized non-chromium chemical conversion coating considerably, which was most attributed to the great inhibitive action on the anodic dissolution by acting as a protective barrier layer.

Formation and corrosion resistance of a phosphate chemical conversion coating on medium carbon low alloy steel

2016 ◽  
Vol 40 (2) ◽  
pp. 1347-1353 ◽  
Author(s):  
Cong-cong Jiang ◽  
Gui-yong Xiao ◽  
Xian Zhang ◽  
Rui-fu Zhu ◽  
Yu-peng Lu
Keyword(s):  
Corrosion Resistance ◽  
Alloy Steel ◽  
Crystalline Structure ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Low Alloy Steel ◽  
Medium Carbon ◽  
Fine Crystalline Structure ◽  
Chemical Conversion Coating

A uniform fine-crystalline structure is obtained upon PCC coating on 35CrMnSi with Fe2+ curing (b).

Phosphate and Stannate Chemical Conversion Coatings Formed on AZ91D Alloys

2009 ◽  
Vol 610-613 ◽  
pp. 1407-1413 ◽  
Author(s):  
Xiang Jie Yang ◽  
Hua Lan Jin
Keyword(s):  
Phase Composition ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Conversion Coatings ◽  
X Ray Diffraction ◽  
Alloy Matrix ◽  
Β Phase ◽  
Before And After ◽  
Loss Method ◽  
Better Than

The morphology and the mass change of the AZ91D alloys matrix after pretreatment, the morphology and the phase composition of chemical conversion coatings formed by phosphate and stannate were studied using scanning electron microscope, X-ray diffraction and the mass loss method. The corrosion resistance of the coatings were studied by salt spay test and damp heat test. The results show that the phase composition of matrix before and after pretreatment is almost changeless and the mass diminishes a litter, the deep micro flaw appears near between α-Mg and β phase during acidic pickling. The phosphate chemical conversion coating is mainly composed of Mg, MgO and some amorphous phase, and the stannate conversion coating is crystal structure and mainly composed of Mg, Al12Mg17 and MgSnO3•3H2O. Results from salt spay test and damp heat test indicate that the two coatings also can provide good protection for the magnesium alloy matrix, and stannate is better than phosphate.

Novel Strontium Doped Zinc Calcium Phosphate Conversion Coating on AZ31 Magnesium Alloy for Biomedical Applications

2017 ◽  
Vol 34 ◽  
pp. 57-67 ◽  
Author(s):  
P. Amaravathy ◽  
T.S. Sampath Kumar
Keyword(s):  
Magnesium Alloy ◽  
Calcium Phosphate ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Az31 Magnesium Alloy ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Simple Chemical ◽  
High Degree

A simple chemical conversion coating was adopted to deposit zinc calcium phosphate (ZCP) coating and strontium doped ZCP (SZCP) coating on AZ31 magnesium alloy to induce biocompatibility and reduce the degradation rate. The surface morphology, chemical composition and functional groups of the coating were characterized by Scanning Electron Microscopy with Energy Dispersive X-Ray Spectroscopy (SEM-EDS), X-Ray Diffraction (XRD) studies and Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy respectively. SZCP coating formed at 20 min deposition time produced crack free surface with a high degree of crystallinity with barrier property, which ultimately retards the dissolution of magnesium in Simulated Body Fluid (SBF). The corrosion resistance of AZ31 magnesium alloy was improved by SZCP coating as evident from hydrogen evolution test (HET). Cytotoxicity evaluation with L969 cells showed that Sr doped ZCP coatings showed less toxicity on resorbable magnesium alloys.

Corrosion Behavior and Microstructure of Pd Ions Doped Cerium Conversion Coating on AA2219-T87 Aluminum Alloy

2015 ◽  
Vol 1090 ◽  
pp. 79-83
Author(s):  
Yan Hong He ◽  
Zhen Duo Cui ◽  
Xian Jin Yang ◽  
Sheng Li Zhu ◽  
Zhao Yang Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Photoelectron Spectroscopy ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Conversion Coating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Excellent Corrosion Resistance

In this paper, Pd ions doped cerium conversion coating (CeCC/Pd) was deposited on AA2219-T87 aluminum alloy by electroplating. The microstructure and composition of the coating were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). Corrosion behavior of AA2219-T87 aluminum alloy with the coating was investigated in 3.5wt.% NaCl solution at the room temperature. XRD and XPS results indicate the existence of cerium-oxide and palladium-oxide in the CeCC/Pd. Polarization curves show that the CeCC/Pd exhibits excellent corrosion resistance. The corrosion current density of the CeCC/Pd decreases by two orders of magnitude compared with the CeCC. The improvement of corrosion resistance would be attributed to the small grain size, good compactness and adhesive strength of the composite coatings.

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