Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al–Mg Alloy Layer

Park, Il-Cho; Kim, Seong-Jong

doi:10.1007/s40195-016-0437-7

Cited by 19 publications

(9 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result suggests that 1 M NaH2PO4 with 0.1 Ca(NO3)2 i.e., SPCN3, is not beneficial for corrosion resistance at a longer duration of exposure in 3.5 wt.% NaCl solution but at a shorter duration i.e., up to 11 days it has shown highest impedance ( Figure 5) owing to the greater filling ability of defects. It is reported that if the coating shows Ecorr at −0.870 V vs. Ag/AgCl then such type of coating is considered as a sacrificial coating [68]. Since, in the present study, AC, SPCN1, and SPCN2 exhibit more than −0.870 V vs. Ag/AgCl, it indicates that these coatings are providing sacrificial protection to the steel even after 89 days of exposure in 3.5 wt.% NaCl solution.…”

Section: Potentiodynamic Polarization Resultsmentioning

confidence: 48%

Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

et al. 2020

View full text Add to dashboard Cite

Aluminum coating was deposited by arc thermal spraying process onto the steel substrate for the corrosion protection in aggressive environment. However, the arc thermal sprayed coating possesses defects in the coating. Thus, it is important to reduce the defects and enhance the corrosion resistance properties of the deposited coating using post-treatment. In the present study, we have used different concentrations of sodium phosphate mono basic (NaH2PO4) with 0.1 molar (M) calcium nitrate [Ca(NO3)2] as post-treatment solution to fill out the defects of the Al coating. It was observed by scanning electron microscopy (SEM) that 1 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample exhibited 71% reduction in defects compared to as coated samples. X-ray diffraction (XRD) was performed to determine the phases formed on the coating surface after treatments. XRD confirms the formation of sodium aluminum hydrogen phosphate (Na3Al(OH)(HPO4)(PO4)) and brushite (Ca(HPO4)(H2O)2) as composite oxides on the Al coating. Electrochemical results show that 0.5 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample has exhibited the highest charge transfer resistance and the lowest corrosion current density after 89 days of exposure in 3.5 wt.% NaCl solution. The enhancement in corrosion resistance of 0.5 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample attributed to the formation of adherent, sparingly soluble, and stable corrosion products. The volume fraction result of the corrosion products formed on 0.5 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample after 89 days of exposure in 3.5 wt.% NaCl using XRD confirms the highest amount of Bayerite (α-Al(OH)3) deposition, thus, the corrosion rate of this sample was the lowest.

show abstract

Section: Potentiodynamic Polarization Resultsmentioning

confidence: 48%

Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Moreover, the Al coating exposed to 3.5 wt. % NaCl solution provides cathodic protection where its corrosion potential (Ecorr) is greater than -0.870 V vs Ag/AgCl (Park and Kim, 2016) while in SAE J2334 solution, it is gradually corroded.…”

Section: Deposition Of Al Coating and Characteristicsmentioning

confidence: 99%

Application of Arc Thermal Spray Process in Corrosion Protection of Steels and Electromagnetic Pulse Shielding

Singh

2023

Prabha Materials Science Letters

View full text Add to dashboard Cite

In the present work, an overview has been discussed on the application of arc thermal spray technology. This process used in erosion, corrosion and electromagnetic pulse (EMP) shielding. The Al coating exhibits excellent corrosion properties in simulated weathering i.e., Society of Automotive Engineers (SAE) J2334 as well as 3.5 wt.% NaCl solution at long run of application. However, weathering condition possesses Cl- and CO3-- ions, which simultaneously influence in the deterioration of Al coating. Once the Zn is alloyed with Al in coating, it enhances the corrosion attributed to the formation of severe defects and galvanic coupling between Al and Zn. The stainless steel and Ti coatings have been used on the concrete surface to reduce the corrosion of waste water reservoir where Ti is exhibited more corrosion resistance due to dense and uniform morphology as well as on the surface of Ti coating during exposure in acidic solution, it forms rutile and anatase, which further provide corrosion protection. Moreover, the Zn has beneficial properties in regards of EMP shielding rather than iron and Cu plate. Zn with copper has excellent EMP shielding compared to pure Cu. As the thickness is increased, the EMP shielding properties are increased. From this review article, it is suggested to reduce the porosity of arc thermal sprayed coating using some chemical post treatment.

show abstract

“…There are many published studies of the Al-Mg alloy coatings in recent years. [1][2][3][4][5][6][7][8] he corrosion resistance in 3.5 wt.% NaCl solution of flamesprayed Al-5Mg alloy coating has better than that of Al-2.5Mg coating. [1] The Al-Mg coatings with high Mg content have lower surface strength and higher resistance to the development of cracks than the coatings with low Mg content.…”

Section: Introductionmentioning

confidence: 99%

“…[2] The corrosion resistance of the cold sprayed Al-Mg coating is higher than that of the cold sprayed pure Al coating in the actual marine environment. [3][4][5] The service lifetime of the Al-Mg alloy coating can be improved by using the organic coating, preventing contact with the corrosion solution. [6] In the authors' previous study, the spray mode consisting of spray current, pneumatic pressure, and stand-off distance were optimized using the Taguchi method.…”

Section: Introductionmentioning

confidence: 99%

Study on microstructure, mechanical and wear resistance properties of arc sprayed Al‐Mg alloy coating

Le Duc,

Thi,

Van

et al. 2023

Vietnam Journal of Chemistry

View full text Add to dashboard Cite

In this investigation, Al‐Mg alloy coating samples were deposited by the electric arc spray technique on SS400 steel substrate at various spraying parameters, namely, the spray current (150, 200 and 300 A), the air pressure (4, 4.5 and 5.5 bar) and the stand‐off distance (100, 162.8 and 200 mm). The structure morphology, phase composition, porosity, microhardness, adhesion and wear resistance of the coating were studied. The obtained results showed that the coating at the spray current of 300 A, the air pressure of 5.5 bar and the stand‐off distance of 162.8 mm has the lowest porosity and highest microhardness. In addition, this coating also has better adhesion to the steel substrate and wear resistance than other coatings. Moreover, X–ray phase analysis showed that the following phases are created on the surface of the Al‐Mg coatings: Al, Al2MgO4 and Al3Mg2.

show abstract

Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al–Mg Alloy Layer

Cited by 19 publications

References 29 publications

Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

Application of Arc Thermal Spray Process in Corrosion Protection of Steels and Electromagnetic Pulse Shielding

Study on microstructure, mechanical and wear resistance properties of arc sprayed Al‐Mg alloy coating

Contact Info

Product

Resources

About