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Inorganic zinc silicate coating Preparation and Properties

Author: YuShiYou
Tutor: LiNing
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: Inorganic zinc-rich coating of silicon Silane coupling agent Corrosion resistance Arc spraying
CLC: TQ630.1
Type: Master's thesis
Year: 2010
Downloads: 191
Quote: 0
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Abstract

With the social development of green products get more and more attention. In the marine corrosion engineering of traditional organic zinc-rich coating of volatile organic compounds, poor weather. The new water-based environmentally friendly non-toxic inorganic silicate zinc-rich coating, low price and excellent corrosion resistance. However, inorganic zinc silicate coating easy to crack, good adhesion with the substrate, which restrict its use. To further advance its industrial application, especially in the practical application of marine splash zone, conducted this research. This paper studies the inorganic silicate zinc-rich coating preparation process (solid-liquid ratio, the synthesis temperature, the proportion of potassium silicate and silica sol, etc.) on the coating properties. The results showed that: the appropriate coating liquid ratio should be 2:1. Temperature 20 ℃ synthetic base fluid performance can be good coating; temperature rise, the coating easy to crack; experiments coupling agent may be added to improve the bonding strength by adding a coupling agent having a short C-chain structure is better ; the proportion of potassium silicate and silica sol coating on the corrosion resistance of zinc greater impact, the ratio was 4:1, the best corrosion resistance coating; while zinc powder particle size, the aim should be 500 ball zinc tablets zinc powder worst. Process parameters have been optimized using synthetic zinc-rich coating, the coating high hardness, good adhesion, heat water, solvents, salt water corrosion (30 days no rust). Inorganic zinc silicate coating studied 3.5mass% NaCl solution in the electrochemical behavior of zinc coatings made of inorganic silicon protective effect produced three stages: the initial immersion zinc coating zinc dissolution occurs; immersion medium corrosive medium into the pores of the powder coating being; late clogged pores coated corrosion products, shielding the corrosive medium, the matrix play a good protection. Throughout this process the coating corrosion potential overall upward trend. The use of a coupling agent coating modification experiments. C is studied by coupling the base liquid zinc coating. Coating can be cured at room temperature, but the film is not dense poor corrosion resistance. The fluid coupling KH560 zinc based coating after curing at 120 ℃ 10min, high hardness, corrosion resistance better than the coupling agent C based coating. The coupling agent is added in KH560 JH602, coating may be cured at room temperature, and the test period showed good corrosion resistance. Alternative coatings on zinc silicate filler for screening. To magnetic iron oxide black as the main object of study, its doping, adding zinc powder (ratio of 1:1). Got light black coating and water resistance than pure iron oxide coating increased. EIS systems indicate immersion in salt water the coating after a period of time significantly enhanced corrosion resistance, zinc anti-corrosion coating exhibit features. Arc Spraying three types of carbon steel and stainless steel: 3Cr13, 316L and 304 (nitrogen) spray coating. Integrated from corrosion resistance, electrochemical protection point of view, 304 (nitrogen) spray coating, 316L coating layers exhibit the inorganic zinc silicate coating with good matching.

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