Cavity corrosion proof zinc-rich paint and preparing method thereof

Abstract

A zinc-enriched coating against cavity corrosion and its production are disclosed. The coating consists of carbon nanometer tube: 0.3-4 wt%, nanometer zinc powder 3-8 wt%, and organic resin additive 12-30 wt%. The process is carried out by reflux decontaminating for carbon nanometer tube by mixed acid, soaking in diluted lithium aqueous glass, centrifugal treating, collecting or mixing carbon nanometer tube with silicon acid, ball grinding, adding carbon nanometer tube into lithium silicate-sodium silicate solution, adding into organic resin, heavy potassium chromate solution, FC80, methyl-methoxide, multifunctional accessories and de-foaming agent while agitating to obtain coating component A, mixing ordinary zinc powder with nanometer zinc powder proportionally to obtain coating component B, and mixing component A with component B proportionally to obtain final product.

Description

technical field [0001] The invention relates to an anti-corrosion and anti-cavitation corrosion zinc-rich coating suitable for ship appendages and a preparation method thereof. Background technique [0002] The propellers, nozzles, tail shaft brackets, tail fins and rudder blades of the ship have been immersed in water for many years, and corrosion phenomena are common, and cavitation corrosion is particularly serious. Due to the damage of the appendage structure, the ship is often suspended for maintenance , not only caused great economic losses, but also seriously affected the ship's voyage rate. [0003] The extremely destructive mechanical action and electrochemical action are the two main factors leading to cavitation corrosion. In addition to correct material selection, reasonable structural design and proper cathodic protection, effective surface protection technology is the most effective surface protection technology to prevent cavitation corrosion. One of the fund...

AI Technical Summary

Problems solved by technology

The ceramic material is dense, low porosity, and its high mechanical strength can resist mechanical action, but it requires high-temperature sintering or plasma spraying technology, which is brittle and fragile, and it is not easy to maintain; seawater containing various ions has a strong corrosion effect on the material. Even alloyed metal materials have insufficient corrosion resistance, short service life, and high cost; the advantages of elastomers are compactness, strong impact absorption, and strong anti-corrosion capabilities, but thick elastomers affect work efficiency and are not resistant to aging In addition, the elastic modulus difference between the elastomer layer and the base material is too large, and multiple strong impacts will cause fatigue deformation, separation between layers, and peeling off

[0004] Compared with the above materials, inorganic zinc-rich coatings are heavy-duty anti-corrosion coatings with excellent performance. However, when used directly as an anti-cavitation corrosion coating, there is a disadvantage that the material is relatively "brittle"