Water-based brass antioxidant with benzimidazole added and good weldability and preparation method thereof

Abstract

The invention discloses a water-based brass antioxidant with benzimidazole added and good weldability. Each liter of antioxidant is prepared from the following raw materials including, by weight, 11-13 parts of 50wt.% phytic acid, 26-28 parts of 30wt.% hydrogen peroxide, 12-13 parts of polyethylene glycol, 2-4 parts of nano calcium carbonate, 3-4 parts of magnesium dihydrogen phosphate, 1-2 parts of sodium citrate, 2-3 parts of sodium carboxymethylcellulose, 8-10 parts of water-borne epoxy resin emulsion, 1.7-1.9 parts of tea polyphenol, 0.6-0.8 part of benzimidazole, 2.2-2.4 parts of gamma-chloropropyl trimethoxysilane and an appropriate amount of deionized water. The phytic acid and the hydrogen peroxide serve as main components, the phytic acid is subjected to silane coupling agent modification, then nano calcium carbonate modified through the benzimidazole and the other components are added for compatible application, the obtained antioxidant can be directly dissolved in water, the product is coated to the surface of brass and is not prone to falling off even after being subjected to repeated high temperature impact, the weldability is good, the corrosion resistant time is long, and the antioxidant and anti-discoloration capacity is high.

Description

technical field [0001] The invention relates to the technical field of metal anti-oxidation, in particular to a water-based brass anti-oxidant with good weldability by adding benzimidazole and a preparation method thereof. Background technique [0002] Brass is an alloy composed of copper and zinc. It not only has the advantages of excellent electrical conductivity, thermal conductivity and easy processing, but also has sufficient mechanical strength, hardness and chemical corrosion resistance. It is often used in the manufacture of valves, water pipes, Air conditioner internal and external unit connecting pipes and radiators, etc. However, it is still prone to oxidative corrosion and discoloration when encountering acidic or alkaline corrosive media or in a relatively high temperature and high humidity environment, which seriously affects the appearance and use value, and also has a negative impact on secondary processing. At present, the anti-oxidation and discoloration t...

AI Technical Summary

Problems solved by technology

[0004] However, in the environment with high humidity, the phytic acid film in the literature has poor moisture resistance and short storage time. When it is coated on the surface of brass for secondary processing, its high temperature resistance is limited, and it cannot be kept for a long time during the welding process. time and multiple high-temperature shocks; secondly, the passivators prepared in the literature also have problems such as short anti-oxidation time, poor environmental adaptability, single function, poor thermal stability, poor weather resistance, and poor sun and ultraviolet radiation resistance, thus limiting In order to improve the overall performance and application range, it is necessary to improve the existing production process and formula, and prepare antioxidants for brass surface treatment with functions such as anticorrosion, anti-oxidation, wear resistance, and sun protection.