A kind of marine anti-corrosion inorganic coating and preparation method thereof

An inorganic coating and marine anti-corrosion technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of easy aging and peeling of organic coatings, inconvenient coating protection implementation, limited corrosion resistance, etc., to achieve Excellent volume stability, good chemical corrosion resistance, and good coating quality

Active Publication Date: 2019-09-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, technologies such as petrolatum coating protection, organic coating protection and ceramic coating protection are mainly used in the field of marine anti-corrosion. Among them, the coating protection is inconvenient to implement and the application range is limited; while the organic coating is easy to age and peel off, and the validity period is short
At present, alumina ceramic coatings are widely used in the field of marine protection, but their corrosion resistance is limited

Method used

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  • A kind of marine anti-corrosion inorganic coating and preparation method thereof
  • A kind of marine anti-corrosion inorganic coating and preparation method thereof
  • A kind of marine anti-corrosion inorganic coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] (1) Mix analytically pure calcium carbonate and silicon dioxide at a molar ratio of 2:1, heat at 1400°C for 3 hours, and synthesize γ-dicalcium silicate through solid-state reaction;

[0047] (2) Sieve the gamma dicalcium silicate powder, take the powder with a particle size of 30-50 μm, and reserve it for spraying;

[0048] (3) The metal substrate is a 304 stainless steel rectangular test piece with a size of 30mm×15mm×1.25mm. Pretreatment of the surface of the metal substrate to be sprayed: sandblasting, ultrasonic cleaning, compressed air drying;

[0049] (4) Atmospheric plasma spraying: The atmospheric plasma spraying process is used to spray a 20 μm NiCr transition layer and a 130 μm dicalcium silicate coating on the surface pretreated metal substrate, and the process parameters for spraying the NiCr transition layer are: The flow rate of plasma gas argon gas is 57slpm, the flow rate of plasma gas hydrogen gas is 8slpm, the spraying current is 600A, the voltage is...

Embodiment 2

[0052] After soaking the samples obtained in Example 1 in 3.5wt% NaCl solution for different periods of time, the polarization curves were detected. The detection method of the polarization curve is: Ametek 1287&1260 test system is used, the saturated calomel electrode is used as the reference electrode, the electrolyte is 3.5wt% NaCl solution, the voltage test range is -0.5~0.6V (reference open circuit voltage), and the scan rate is 0.5mV / s.

[0053] image 3 Table 1 and Table 1 respectively show the polarization curve and corrosion parameters of the sample obtained in Example 1 after soaking in 3.5wt% NaCl solution.

[0054] Corrosion parameters of the sample obtained in Table 1 Example 1 soaked in 3.5wt% NaCl solution

[0055]

[0056] From image 3 It can be seen from Table 1 that after immersion for 30 days, the corrosion current density of the sample remained at 1.61×10 -6 (A / cm 2 ).

Embodiment 3

[0058] The sample obtained in Example 1 was corroded by 5.0wt% NaCl solution for 24 hours with alternating wet and dry salt spray. Figure 4 Photo for salt spray corrosion. It can be seen that after the dicalcium silicate coating sample was corroded for 42 days in the dry-wet alternating salt spray chamber, the coating surface did not appear corrosion characteristics such as blistering, peeling, and rust spots. The surface white matter in the figure is the soaking product of dicalcium silicate in sodium chloride solution, namely calcium carbonate and calcium carbonate monohydrate.

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Abstract

The invention relates to a marine anti-corrosion inorganic coating and a preparation method thereof. The marine anti-corrosion inorganic coating comprises a beta-dicalcium silicate ceramic layer formed on a base material. In the marine anti-corrosion inorganic coating and the preparation method thereof, the beta-dicalcium silicate ceramic layer is hardened when making contact with water to form C-S-H gel, the later-period strength is large, dicalcium silicate is low in hydration heat, small in air shrinkage, resistant to temperature, resistant to freezing, good in size stability, resistant tochemical erosion and good in abrasion resistance, and thus the marine anti-corrosion inorganic coating can protect marine facilities such as ship bodies for a long time to prevent the marine facilities from being corroded.

Description

technical field [0001] The invention relates to a marine anti-corrosion inorganic coating and a preparation method thereof, belonging to the field of inorganic material marine anti-corrosion. Background technique [0002] The ocean covers about 70.9% of the earth's surface, and the navigation and marine industries have become an important pillar of the world's economic development. Corrosion is one of the main causes of damage and scrapping of various infrastructure and industrial equipment. Seawater is a strong natural corrosive medium, containing Na + 、K + , Ca 2+ , Mg 2+ , Cl - , CO 3 2- , SO 4 2- Plasma, with a salt concentration as high as 3.5wt%, rich in oxygen, coupled with the impact of waves and sunlight, the marine corrosion environment is extremely harsh. Any marine engineering materials, especially metal structural materials, will be corroded to varying degrees in the marine environment. Metal materials are mainly used in ships and marine engineering s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/04C23C4/134
Inventor 邵芳肖媛陶顺衍赵华玉庄寅倪金星
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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