Characteristics and Application of Seawater Anti-corrosion Coatings

The beauty of the sea makes people feel relaxed and happy. In the boundless sea, there is a lot of power. This sea of ​​water has caused many poets to think about it infinitely. Yes, the sea is getting closer to us. We are getting more and more apart from the sea. The sea gives us spiritual power and gives me life. But now the sea has forced us to corrode and damaged our equipment—that is, the corrosion of seawater salt.

Seawater contains about 3.5% salt, most of which is sodium chloride, and a small amount of magnesium chloride, potassium, calcium carbonate and so on. Oceanic seawater is slightly alkaline with a pH of approximately 8. Zhisheng Weihua chemists believe that despite the continuous increase and decrease in the number of substances, at least the past 600 million years, the main composition of the sea water remains the same, so Zhisheng Weihua exclusive research and development of ZS-711 seawater anti-corrosion coating, targeted, seawater corrosion resistance it is good.

Zhisheng Weihua seawater anti-corrosion coating performance test:

Seawater corrosion is mainly chloride ion corrosion, chloride ions can damage the protective layer of the metal oxide film, pitting or pitting corrosion, intergranular corrosion of the metal. Under the action of tensile stress, the metal will crack in the area where the passivation film is damaged, and become the anode area of ​​the corrosion battery. Continuous electrochemical corrosion may eventually lead to metal fracture. This corrosion is not related to the concentration of chloride ions. Even a trace amount of chloride ions may cause stress corrosion. But it has a lot to do with temperature. ZS-711 Zhisheng seawater anti-corrosion coating produced by Beijing Zhisheng Weihua is composed of a new type of Zhisheng Weihua inorganic polymer and dispersed and activated metal, metal oxide nano-materials, and ultra-fine ultra-fine powders, and can quickly react with iron atoms on the metal surface. The reaction produces a dual physical and chemical protection. The coating can withstand chloride ion corrosion for a long period of time. Effective protection of metals and other materials is not corroded by seawater.

In seawater, the force corrosion can not be ignored. The force corrosion is divided into, and the point corrosion force begins to corrode. Due to the corrosion, the corrosion site becomes black or becomes dark brown. In most severely corrosive environments, the number and depth of pitting corrosion increases, giving the surface a corroded appearance. Under weak corrosion conditions, experts at Zhisheng Weihua Seawater Corrosion Coatings believe that pitting corrosion itself cannot be significantly reduced from the surface, but corrosion may occur on the surface to produce a thin film. When the rust stains seep out, it may lose luster around the metal surface. Stress Corrosion Cracking (SCC) Stress corrosion cracking may occur. When the stainless steel is in the chloride aqueous solution environment, chloride ion stress corrosion cracking may occur. For example, in the sea fog environment, steel is under high tensile stress, and the temperature exceeds the normal ambient temperature (usually more than 60°C) environment. In life, there is a high concentration of chloride ion water, the concentration of 10000mg / l, PH is about 10, Zhisheng Weihua 711 seawater anti-corrosion coating brushing three times, coating life can reach more than 5 years. Because the structure and composition of the coating show that its protective mechanism is not a single electrochemical protection, but a combination of electrochemical protection, physical shielding, corrosion inhibition, and passivation, the chlorine resistance time of the coating is greatly increased.