Effect of Standoff Distance on Corrosion Resistance of Cold Sprayed Titanium Coatings
Abstract
:1. Introduction
2. Experimental Details
2.1. Materials and Methods
2.2. Solutions
2.3. Electrodes
2.4. Electrochemical Measurements
2.5. Surface Morphologies and Microstructure
2.6. Microhardness
3. Results and Discussion
3.1. Surface Morphologies
3.2. Microhardness
3.3. Corrosion Test
3.3.1. Corrosion Electrochemical Parameters
3.3.2. Polarization Resistance and Corrosion Rate
3.3.3. Chronoamperometric Measurements
3.4. Microstructure Titanium Coatings
4. Conclusions
- The different standoff distance of the nozzle from the specimen surface (i.e., 20 mm, 70 mm, and 100 mm) in the cold spray process has a significant influence on the properties of the Al7075/Ti coating.
- Titanium coatings adhere well onto Al7075 alloy, and the most homogeneous and smooth surface of the Ti coating was obtained when the nozzle distance from the sample surface was 70 mm.
- The microhardness (HV0.3) of the deposit depend significantly on the nozzle distance. The highest level of HV0.3 value was achieved for deposits obtained with the SoD of 70 mm.
- There were no phase changes in the phase composition of the titanium deposits due to the increased of SoD.
- Corrosion test (electrochemical method) of the titanium coatings onto Al7075 substrate were carried out in acidic chloride solutions.
- The mechanism of electrochemical corrosion of titanium coatings is a multi-stage process, and the main product of the corrosion process was (TiO2)ads. The oxide layer did not protect the materials against the penetration of the aggressive solution.
- The polarization resistance (Rp) of the Ti coatings was the highest, while the corrosion rate (υcorr) was the lowest, for the SoD of 70 mm. Thus, in this case, the exchange of mass and electrical charge between the electrode and the electrolyte solution is significantly impeded.
- The titanium surface on the Al7075 substrate was slightly damaged when exposed to an acid chloride solution, while still protecting the aluminum substrate from the corrosive effects of the environment.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Sample | Distance d, mm |
---|---|
Al7075/Ti-20 | 20 |
Al7075/Ti-70 | 70 |
Al7075/Ti-100 | 100 |
Sample | Microhardness HV0.3 |
---|---|
Al7075/Ti-20 | 200 ± 2 |
Al7075/Ti-70 | 248 ± 1 |
Al7075/Ti-100 | 218 ± 3 |
Sample | Ecorr mV vs. SCE | jcorr mA cm−2 | −bc | ba |
---|---|---|---|---|
mV dec−1 | ||||
Al7075/Ti-20 | −670 | 2.80 | 350 | 250 |
Al7075/Ti-70 | −643 | 1.60 | 340 | 380 |
Al7075/Ti-100 | −652 | 1.90 | 380 | 300 |
Sample | Rp kΩ cm2 | vcorr mm y−1 |
---|---|---|
Al7075/Ti-20 | 23 | 24.30 |
Al7075/Ti-70 | 49 | 13.90 |
Al7075/Ti-100 | 38 | 16.50 |
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Scendo, M.; Staszewska-Samson, K. Effect of Standoff Distance on Corrosion Resistance of Cold Sprayed Titanium Coatings. Coatings 2022, 12, 1853. https://doi.org/10.3390/coatings12121853
Scendo M, Staszewska-Samson K. Effect of Standoff Distance on Corrosion Resistance of Cold Sprayed Titanium Coatings. Coatings. 2022; 12(12):1853. https://doi.org/10.3390/coatings12121853
Chicago/Turabian StyleScendo, Mieczyslaw, and Katarzyna Staszewska-Samson. 2022. "Effect of Standoff Distance on Corrosion Resistance of Cold Sprayed Titanium Coatings" Coatings 12, no. 12: 1853. https://doi.org/10.3390/coatings12121853