Study on the Corrosion Behavior of D36 Steel Plate and H62 Copper Alloy Net for Marine Aquaculture Facilities in Simulated Seawater
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Materials
2.2. Sample Preparation and Pretreatment
2.2.1. Single Metal Immersion Experiment
2.2.2. Galvanic Corrosion Experiment
2.2.3. Electrochemical Test
2.3. Experimental Equipment and Measurement
2.3.1. Single Metal Immersion Experiment
2.3.2. Galvanic Corrosion Experiments
2.3.3. Electrochemical Test
2.3.4. Tensile Test
3. Results
3.1. Electrochemical Test
3.1.1. Open Circuit Potential (OCP)
3.1.2. Polarization Curve
3.1.3. Electrochemical impedance spectrum (EIS)
3.1.4. Galvanic Potential and Galvanic Current
3.2. Corrosion Morphology and Mass Loss
3.2.1. Corrosion Morphology
3.2.2. Weight Loss Analysis
3.3. Variation of Mechanical Properties of Copper Alloy Mesh
4. Discussion
4.1. Effect of Salinity on Corrosion
4.2. Effect of Layer Thickness on the Rate of Galvanic Corrosion of Copper Alloy and Steel
4.3. Effect of Overlapping Area on the Rate of Galvanic Corrosion of Copper Alloy and Steel
4.4. Shortcomings and Further Prospects
5. Conclusions
- (1)
- Salinity is an important factor affecting the corrosion of metals. In the simulated seawater solution, the corrosion rate of H62 copper alloy mesh and D36 steel plate also increased significantly with the increase of NaCl concentration. At the same time, the corrosion rate of both materials showed a trend of faster and then a slower trend in the short term with time. The OCP results showed that the copper alloy potential was more positive; the steel plate was negative, indicating that two materials had the tendency of galvanic corrosion (copper alloy was as the cathode, and the steel plate was as the anode material);
- (2)
- The bedding layer thickness and the overlapping area both played a role in protection of the steel plate when the H62 mesh and D36 steel were coupled in seawater. With the increase of bedding layer thickness and overlapping area, the galvanic couple corrosion rate had a certain degree of reduction. Under the “large anode, small cathode” overlapping mode, the larger the overlapping area, the more moderate rise, although the corrosion rate was rising;
- (3)
- The maximum force and tensile strength of the mesh in different corrosion conditions were also different. The smaller the concentration of NaCl solution, the smaller the corrosion rate of the mesh, and the greater the maximum force and tensile strength. At the same time, the maximum force and tensile strength of the meshes decreased when the thickness of the layer and overlapping area increased.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Materials | Cu | Mn | P | S | Si | Cr | C | Ni | Fe | Pb | Zn |
---|---|---|---|---|---|---|---|---|---|---|---|
H62 | 61.82 | - | - | - | - | - | - | 0.28 | 0.08 | 0.015 | Bal. |
D36 | 0.018 | 1.38 | 0.016 | 0.006 | 0.25 | 0.021 | 0. 15 | 0.008 | Bal. | - | - |
Case | NaCl Concentration | Immersion State | Layer Thickness (mm) | Overlapping Area (cm2) |
---|---|---|---|---|
1 | 1.5 | semi-immersed state | - | - |
full-immersed state | ||||
2 | 2.5 | semi-immersed state | - | - |
full-immersed state | ||||
3 | 3.5 | semi-immersed state | - | - |
full-immersed state | ||||
4 | 3.5 | semi-immersed state | 5 | - |
5 | 10 | - | ||
6 | 15 | - | ||
7 | - | 28 | ||
8 | - | 52 | ||
9 | - | 100 |
Material | Conditions | E/V | Current Density/log [I/(A·cm2)] |
---|---|---|---|
H62 | 1.5% (semi-immersed state) | −0.291 | −9.104 |
1.5% (full-immersed state) | −0.416 | −6.494 | |
2.5% (semi-immersed state) | −0.324 | −5.177 | |
2.5% (full-immersed state) | −0.437 | −5.793 | |
3.5% (semi-immersed state) | −0.460 | −5.386 | |
3.5% (full-immersed state) | −0.473 | −5.578 | |
D36 | 1.5% (semi-immersed state) | −0.570 | −7.201 |
1.5% (full-immersed state) | −0.638 | −5.155 | |
2.5% (semi-immersed state) | −0.5907 | −5.171 | |
2.5% (full-immersed state) | −0.6655 | −5.683 | |
3.5% (semi-immersed state) | −0.596 | −4.708 | |
3.5% (full-immersed state) | −0.6735 | −4.497 |
Material | Conditions | R | Y0 | n | Rf | Y0 | n | Rct |
---|---|---|---|---|---|---|---|---|
(Ω × cm2) | (S × s n/m2) | (Ω · cm2) | (S × s n/m2) | (Ω × cm2) | ||||
H62 | 1.5% (semi-immersed) | 0.8332 | 2.88 × 10−6 | 1 | 69.4 | 5.453 × 10−5 | 0.618 | 8945 |
1.5% (full-immersed) | 0.7168 | 1.09 × 10−6 | 1 | 25.14 | 2.245 × 10−4 | 0.664 | 8622 | |
2.5% (semi-immersed) | 1.182 | 1.068 × 10−5 | 1 | 15.81 | 8.706 × 10−5 | 0.69 | 4870 | |
2.5% (full-immersed) | 0.6016 | 4.936 × 10−6 | 1 | 96.18 | 4.893 × 10−5 | 0.698 | 4921 | |
3.5% (semi-immersed) | 0.6992 | 5.811 × 10−6 | 1 | 137.1 | 5.776 × 10−5 | 0.683 | 4830 | |
3.5% (full-immersed) | 0.4737 | 5.007 × 10−6 | 1 | 27.1 | 8.822 × 10−5 | 0.643 | 3752 | |
D36 | 1.5% (semi-immersed) | 1.195 | 7.488 × 10−6 | 0.992 | 32.45 | 7.027 × 10−4 | 0.735 | 744.1 |
1.5% (full-immersed) | 15.59 | 1.429 × 10−3 | 0.765 | 819.3 | 6.906 × 10−4 | 0.84 | 0.01215 | |
2.5% (semi-immersed) | 0.4326 | 8.764 × 10−6 | 0.965 | 9.394 | 1.726 × 10−3 | 0.824 | 501.9 | |
2.5% (full-immersed) | 0.4952 | 5.479 × 10−6 | 0.995 | 6.337 | 1.48 × 10−3 | 0.794 | 757.4 | |
3.5% (semi-immersed) | 7.697 | 7.7 × 10−4 | 0.771 | 38.64 | 6.872 × 10−5 | 0.973 | 1313 | |
3.5% (full-immersed) | 0.9896 | 3.065 × 10−6 | 0.973 | 16.01 | 2.274 × 10−3 | 0.777 | 182.2 |
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Gao, F.; Gui, F.; Feng, D.; Qu, X.; Hu, F.; Yang, X. Study on the Corrosion Behavior of D36 Steel Plate and H62 Copper Alloy Net for Marine Aquaculture Facilities in Simulated Seawater. J. Mar. Sci. Eng. 2023, 11, 975. https://doi.org/10.3390/jmse11050975
Gao F, Gui F, Feng D, Qu X, Hu F, Yang X. Study on the Corrosion Behavior of D36 Steel Plate and H62 Copper Alloy Net for Marine Aquaculture Facilities in Simulated Seawater. Journal of Marine Science and Engineering. 2023; 11(5):975. https://doi.org/10.3390/jmse11050975
Chicago/Turabian StyleGao, Fengfeng, Fukun Gui, Dejun Feng, Xiaoyu Qu, Fuxiang Hu, and Xu Yang. 2023. "Study on the Corrosion Behavior of D36 Steel Plate and H62 Copper Alloy Net for Marine Aquaculture Facilities in Simulated Seawater" Journal of Marine Science and Engineering 11, no. 5: 975. https://doi.org/10.3390/jmse11050975
APA StyleGao, F., Gui, F., Feng, D., Qu, X., Hu, F., & Yang, X. (2023). Study on the Corrosion Behavior of D36 Steel Plate and H62 Copper Alloy Net for Marine Aquaculture Facilities in Simulated Seawater. Journal of Marine Science and Engineering, 11(5), 975. https://doi.org/10.3390/jmse11050975