Anti-corrosion coating resistance to chloride ion permeability test methods – corrosive Coatings – Coatings Industry
HC coating Network News: Abstract: Determination of oceanic engineering pointed out that the new Anticorrosion coating The importance of the amount of chloride ion penetration. Determination of the specific introduction of a chloride ion content test method.
Key words: anti-corrosion coating; chloride ion content; test method
0 Introduction Corrosion is the world's important issues, mainly the emerging field of marine engineering, including marine facilities, coastal and bay structures, offshore oil drilling platform; modern Transport , Including the highway guard rail, bridges, boats, containers, trains and railway facilities, cars, airport facilities; the energy industry, including hydraulic equipment, water tanks, cylinders, oil refining equipment, oil storage facilities, power transmission equipment, nuclear power, coal; large industrial enterprises, including paper-making equipment, Medicine Equipment, food, chemical equipment, metal containers inside and outside the wall, chemical, steel and petrochemical plant piping, tanks, mines smelting, cement equipment, a corrosive medium on the ground, walls, cement component; municipal facilities, including gas pipelines and their facilities , natural gas pipelines, water facilities, waste disposal equipment.
New anti-corrosion marine engineering is the most popular topic. Concrete structures often harbor in contact with water in wet conditions, chloride ion penetration caused by steel corrosion often leads to concrete structure took place 10 to 20 years, damage, life is seriously threatened. Corrosion damage caused by steel corrosion is mainly relying on a variety of materials into the concrete of chloride ions and chloride ions in sea water continuously infiltrated into the surrounding steel, when the chloride ion content reaches a critical value, the reinforcement of the passive film starts to break lose protective effect on the steel, causing corrosion, reducing its effective cross section, and cause swelling, destruction of protective layer of concrete, creating a vicious cycle, accelerating structural damage; and around the chloride ion content in the steel is still low, not before the damage caused by steel corrosion , on the new concrete measures taken to prevent such corrosion damage, it has a "multiplier" effect. People in the harbor project in general the ratio of concrete to do a lot of improvements, such as cement clinker increased three calcium aluminate, doped silicate slag, coarse aggregate size and limited to the amount of tablets of mixed concrete blast furnace slag, silica fume or fly ash, etc.. But with the heavy duty coating technology advances and the application of modern spraying equipment will be extended to the special heavy-duty coatings Corrosion Coating area is very important. Current harbor works and other works are corrosion on concrete or steel coated with anti-corrosion coatings, anti-corrosion coating to prevent water or moisture penetration of chloride ions on the steel play an effective protection. Therefore, the determination of anti-corrosion coating is necessary resistance to chloride ion penetration. This paper describes a corrosion resistance to chloride ion penetration coating testing methods, to provide some reference.
1 test section 1.1 paint samples and materials
Epoxy sealing Primer , Thick epoxy paint, acrylic polyurethane finish; fineness of paper, 150mm × 150mm; NaCl reference reagents.
1.2 Test apparatus LC-4 computer to the coulomb meter, shown in Figure 1.
Figure 1 LC-4 computer to the Coulomb meter
Coulomb meter
the basic principles of computer: an electrochemical coulometric titration method, it is electrolytically generated in an electrolysis cell titration material, according to Faraday's law and the electrolysis power consumption to calculate the content of the tested substances .
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