Influence of Sulfide Concentration on the Properties of Cr<sub>3</sub>C<sub>2</sub>-25(Ni20Cr) Cermet Coating on Al7075 Substrate
The influence of sulfide (S<sup>2−</sup>) concentration on the corrosion resistance of Cr<sub>3</sub>C<sub>2</sub>-25(Ni20Cr) cermet coating on Al7075 (EN, AW-7075) substrate (Cr<sub>3</sub>C<sub>2</sub>-25(Ni20Cr)/Al7075) was investigated....
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/3/273 |
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| Summary: | The influence of sulfide (S<sup>2−</sup>) concentration on the corrosion resistance of Cr<sub>3</sub>C<sub>2</sub>-25(Ni20Cr) cermet coating on Al7075 (EN, AW-7075) substrate (Cr<sub>3</sub>C<sub>2</sub>-25(Ni20Cr)/Al7075) was investigated. The coating was produced by the cold-sprayed (CS) method. The Cr<sub>3</sub>C<sub>2</sub>-25(Ni20Cr)/Al7075 coatings were modified chemically in solutions containing thioacetic acid amide (TAA). The surface and microstructure of the specimens were both observed by a scanning electron microscope (SEM). The mechanical properties of the Cr<sub>3</sub>C<sub>2</sub>-25(Ni20Cr) coatings were characterized using microhardness (HV) measurements. The corrosion tests of the materials were carried out using the electrochemical method in a acidic chloride solution. The adsorbed (Me<sub>m</sub>S<sub>n</sub>)<sub>ads</sub> layer effectively separates the Cr<sub>3</sub>C<sub>2</sub>-25(Ni20Cr)/Al7075 coating surface from contact with the aggressive corrosive environment. More than a twice lower value of corrosion rate (CW) was obtained for the Cr<sub>3</sub>C<sub>2</sub>-25(Ni20Cr)/Al7075 coating after exposure to the environment with 0.15 M TAA. |
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| ISSN: | 2075-4701 |