1. The seawater has an erosion effect on the exterior of the ship. When the flow velocity is higher than a critical flow velocity wc, the corrosion film of the ship's external appearance is washed away, and the outer appearance of the ship is also subject to wear and tear. This corrosion and wear and solidify to make the steel corrupt. The speed has increased dramatically. Corrosion resistance can be improved by using passivation characteristics such as stainless steel, aluminum alloy, and titanium alloy.
Second, the chlorophyll plants in seawater can increase the oxygen content in seawater. The CO2 emitted by sea creatures increases the acidity of the surrounding seawater. The life and decay of sea creatures can produce acidic substances and H2S, which can accelerate the decay. Some microorganisms themselves have a corrosive effect on electric boats.
Third, the solubility of CO2 gas in seawater is low with increasing temperature and salinity, and increases with the increase of partial pressure of CO2 gas in the atmosphere. Carbonate in seawater has a tense effect on the ship's decay process. In the external appearance of the electric boat, an insoluble protective layer is formed, which is used for the corrosion process of the rot boat.
Fourth, the impact of temperature on seawater corruption is huge. This is because when the oxygen content is sufficiently high, it is the diffusion rate of oxygen that controls the acoustic velocity of the cathode, not the oxygen content. In response to the hull passivated in seawater, the temperature rises, the passivation film stabilizes, and the sensitivity of pitting corrosion, stress corrosion, and corrosion of the hole increases.
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