scholarly journals Anticorrosion Properties of Zn–Al Composite Coating Prepared by Cold Spraying

Coatings ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 210 ◽  
Author(s):  
Xinqiang Lu ◽  
Shouren Wang ◽  
Tianying Xiong ◽  
Daosheng Wen ◽  
Gaoqi Wang ◽  
...  
Keyword(s):  
Composite Coating ◽  
Energy Dispersive Spectrometer ◽  
Salt Spray ◽  
Cold Spraying ◽  
Alloy Coating ◽  
Raw Material ◽  
Neutral Salt ◽  
Accelerated Corrosion ◽  
Al Composite ◽  
Strong Adhesion

In order to slow down the corrosion and wear of offshore equipment, the Zn–Al composite coating was prepared on Q345 substrate by cold spray technique. The mass fraction of Zn and Al in the raw material was 2:3. The microstructure of the original coating was observed by scanning electron microscopy (SEM) and was characterized by energy dispersive spectrometer (EDS). From the composite alloy coating obtained by cold spraying, it was observed that the Zn and Al particles were uniformly distributed without oxidation product, and the powder particles were significantly plastically deformed. The microstructure of the composite coating is very dense and has strong adhesion to the substrate. Neutral salt spray test (NSS) and electrochemical accelerated corrosion test results showed that Zn–Al composite coating can effectively provide corrosion protection.

ANTICORROSION PROPERTIES OF Zn–Al–Mg–ZnO COMPOSITE COATING PREPARED BY COLD SPRAYING

2020 ◽  
Vol 27 (09) ◽  
pp. 1950211
Author(s):  
XINQIANG LU ◽  
SHOUREN WANG ◽  
TIANYING XIONG ◽  
DAOSHENG WEN ◽  
GAOQI WANG ◽  
...  
Keyword(s):  
Raw Materials ◽  
Composite Coatings ◽  
Salt Spray ◽  
Wear Test ◽  
Cold Spraying ◽  
Oxidation Products ◽  
Steel Matrix ◽  
Neutral Salt ◽  
Electrochemical Protection ◽  
Accelerated Corrosion

Two kinds of composite coatings, Zn[Formula: see text]Al[Formula: see text]Mg5ZnO[Formula: see text] and Zn[Formula: see text]Al[Formula: see text]Mg5ZnO[Formula: see text], were prepared on steel matrix (Q235) by cold spraying. The Zn, Al, Mg, and ZnO in raw materials were calculated by percentage of mass. The morphology of the original coating was observed by scanning electron microscopy (SEM) and characterized by energy dispersive spectroscopy (EDS). It was found that the microstructures of Zn[Formula: see text]Al[Formula: see text]Mg5ZnO[Formula: see text] and Zn[Formula: see text]Al[Formula: see text]Mg5ZnO[Formula: see text] composite coatings prepared by cold spraying were compact without oxidation products, and the plastic deformation of powder particles was significant. The friction and wear test data of the two coatings showed that the Zn[Formula: see text]Al[Formula: see text]Mg5ZnO[Formula: see text] coating had longer-lasting protective properties and wear resistance under the same conditions. Neutral salt spray test (NSS) and electrochemical accelerated corrosion test were carried out on samples at different time periods. The results of samples’ corrosion microstructure and electrochemical curves showed that Zn[Formula: see text]Al[Formula: see text]Mg5ZnO[Formula: see text] and Zn[Formula: see text]Al[Formula: see text]Mg5ZnO[Formula: see text] have good electrochemical protection performance, and Zn[Formula: see text]Al[Formula: see text]Mg5ZnO[Formula: see text] coating has better protection effect.

MICROSTRUCTURES AND SALT SPRAY CORROSION BEHAVIORS OF COLD SPRAYED Al COATINGS ON S355 STEEL IN MARINE ENVIRONMENT

2018 ◽  
Vol 25 (06) ◽  
pp. 1850115
Author(s):  
JING ZHANG ◽  
DEJUN KONG
Keyword(s):  
Energy Dispersive Spectrometer ◽  
Salt Spray ◽  
Cold Spraying ◽  
Corrosion Products ◽  
Chemical Compositions ◽  
Neutral Salt ◽  
Salt Spray Corrosion ◽  
Surface And Interface ◽  
Protection Potential ◽  
Al Coating

An Al coating was sprayed on S355 steel using a cold spraying. The surface–interface morphologies, chemical compositions, and phases of the obtained Al coating were analyzed using a field emission scanning electronic microscope (FESEM), energy dispersive spectrometer (EDS), and X-ray diffractometer (XRD), respectively, and the chemical element distributions of Al coating surface and interface were also analyzed using a plane scan, and line scan, respectively. The salt spray corrosion (SSC) of cold sprayed Al coating was investigated using a neutral salt spray (NSS) test, the corrosion products on the Al coating were also analyzed using an EDS and XRD. The result shows that the cold sprayed Al coating is composed of Al phase, the Al particles are distorted when colliding with the substrate, the interface bonding mode is a mechanical bonding. The cold sprayed Al coating is covered with a stable corrosion products, which effectively prevents the coating from further SSC, showing an excellent corrosion resistance. The Al coating has appropriate cathodal protection potential, the corrosion rate of Al coating declines with the time in the electrochemical test.

scholarly journals Microstructure and Corrosion Behavior of Cold-Sprayed Zn-Al Composite Coating

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 931 ◽  
Author(s):  
Zhipo Zhao ◽  
Junrong Tang ◽  
Naeem ul Haq Tariq ◽  
Jiqiang Wang ◽  
Xinyu Cui ◽  
...  
Keyword(s):  
Composite Coating ◽  
Corrosion Behavior ◽  
Salt Spray ◽  
Neutral Salt ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
X Ray ◽  
Corrosion Medium ◽  
Al Composite ◽  
Products Analysis

A Zn–Al composite coating was successfully deposited on Q235 steel by cold spray technology for the corrosion protection in the marine atmosphere. The microstructure and corrosion behavior of the prepared coating was studied byScanning Electron Microscope (SEM), X-ray Diffraction (XRD), salt spray test and electrochemical experiments. A 2400-h neutral salt spray corrosion test (with a corrosion medium of 3.5% sodium chloride solution) showed that the prepared cold-sprayed Zn-Al composite coating has excellent anti-corrosion properties. Based on the microstructure evolution and corrosion products analysis, droplets’ flow-driven ‘synergistic corrosion effect’ was proposed to explain the co-corrosion behavior of Zn and Al particles in the composite coating.

Electrolytic accelerated corrosion morphology for structural steel based on an improved solution

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Qi Si ◽  
Yang Ding ◽  
Liang Zong
Keyword(s):  
Structural Steel ◽  
Atmospheric Corrosion ◽  
Fractal Theory ◽  
Salt Spray ◽  
Neutral Salt ◽  
Mixed Solution ◽  
Corrosion Morphology ◽  
Accelerated Corrosion ◽  
Electrolytic Corrosion ◽  
Surface Morphologies

Abstract Atmospheric corrosion degrades the mechanical properties of steel structures mainly because of stress concentrations caused by an uneven corrosion topography. Electrolytic corrosion is regarded as one of the most efficient indoor accelerated corrosion approaches, while, the uneven atmospheric corrosion topography usually cannot be well simulated by electrolytic corrosion. This study aims to introduce an electrolytic corrosion solution suitable for simulating atmospheric corrosion. The surface morphologies of the structural steel specimens after electrolytic corrosion in three different solutions under various electrification time and magnitude of the current were compared. The surface characteristics of the corroded steel plates were measured by a 3D noncontact surface topography scanner, and analyzed based on surface roughness theory and fractal theory. The results showed that the mixed solution of 0.5% CH3COONa and 0.2% NaCl will produce pitting corrosion on the steel surface, and the surface morphologies of the steel specimens after electrolytic corrosion were consistent with that of neutral salt spray accelerated corrosion test. It is verified that the electrolytic accelerated corrosion in such a solution can simulate actual atmospheric corrosion reasonably.

Corrosion resistance of composite coating used for fastener protection

2019 ◽  
Vol 66 (5) ◽  
pp. 595-602
Author(s):  
Zhifeng Lin ◽  
Likun Xu ◽  
Xiangbo Li ◽  
Li Wang ◽  
Weimin Guo ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Composite Coating ◽  
Marine Environment ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Diffusion Method ◽  
Economic Losses ◽  
Neutral Salt ◽  
Content Type

Purpose The purpose of this paper is to examine the performance of a fastener composite coating system, sherardized (SD) coating/zinc-aluminum (ZA) coating whether it has good performance in marine environment. Design/methodology/approach In this paper, SD coating was fabricated on fastener surface by solid-diffusion method. ZA coating was fabricated by thermal sintering method. Corrosion behaviours of the composite coating were investigated with potentiodynamic polarization curves, open circuit potential and electrochemical impedance spectroscopy methods. Findings Neutral salt spray (NSS) and deep sea exposure tests revealed that the composite coating had excellent corrosion resistance. Polarization curve tests showed that corrosion current density of the sample with composite coating was significantly decreased, indicating an effective corrosion protection of the composite coating. OCP measurement of the sample in NaCl solution demonstrated that the composite coating had the best cathodic protection effect. The good corrosion resistance of the composite coating was obtained by the synergy of SD and ZA coating. Practical implications SD/ZA coating can be used in marine environment to prolong the life of carbon steel fastener. Social implications SD/ZA composite coating can reduce the risk and accident caused by failed fastener, avoid huge economic losses. Originality/value A new kind of composite coating was explored to protect the carbon steel fastener in marine environment. And the composite coating has the long-term anti-corrosion performance both in simulated and marine environment test.

scholarly journals Study on Corrosion Resistance and Wear Resistance of Zn–Al–Mg/ZnO Composite Coating Prepared by Cold Spraying

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 505
Author(s):  
Xinqiang Lu ◽  
Shouren Wang ◽  
Tianying Xiong ◽  
Daosheng Wen ◽  
Gaoqi Wang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Composite Coatings ◽  
Salt Spray ◽  
Cold Spraying ◽  
Neutral Salt ◽  
Corrosion Resistant ◽  
Electrochemical Tests ◽  
Long Term Stability ◽  
Spray Technique

Two composite coatings, Zn65Al15Mg5ZnO15 and Zn45Al35Mg5ZnO15, were prepared by the cold spray technique and were found to be compact, with no pits or cracks, based on scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) investigations. The results of the neutral salt spray (NSS) and electrochemical tests showed that the two composite coatings possess a suitable corrosion performance. However, the Zn45Al35Mg5ZnO15 composite coatings were more corrosion resistant and allowed a better long-term stability. In addition, they were found to exhibit the best wear resistance and photocatalytic degradation efficiency.

scholarly journals Accelerated cyclic corrosion tests

2016 ◽  
Vol 60 (2) ◽  
pp. 46-49
Author(s):  
T. Prošek
Keyword(s):  
Quality Control ◽  
Residual Life ◽  
Material Selection ◽  
Salt Spray ◽  
Life Time ◽  
Poor Correlation ◽  
Neutral Salt ◽  
Accelerated Corrosion ◽  
Corrosion Tests ◽  
Accelerated Corrosion Tests

Abstract Accelerated corrosion testing is indispensable for material selection, quality control and both initial and residual life time prediction for bare and painted metallic, polymeric, adhesive and other materials in atmospheric exposure conditions. The best known Neutral Salt Spray (NSS) test provides unrealistic conditions and poor correlation to exposures in atmosphere. Modern cyclic accelerated corrosion tests include intermittent salt spray, wet and dry phases and eventually other technical phases. They are able to predict the material performance in service more correctly as documented on several examples. The use of NSS should thus be restricted for quality control.

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