Effects of anti-rust agents, liquid corrosion-resistant and salt mist-resistant additives on the performance of water-resistant industrial coatings

effects of anti-flash rust agents, liquid corrosion-resistant and salt mist-resistant additives on the performance of water- Contribution: Liu Mulin / Shanghai Zhongji Bank Chemical Co., Ltd.Flash rust, corrosion are all belong to the category of electrochemical corrosion of metals, flash rust is a rapid change in external reaction conditions under the electrochemical instantaneous metal corrosion, and metal corrosion is a relatively long electrochemical reaction process, anti-flash rust agent, liquid corrosion inhibitor, salt spray aid is to inhibit or slow down the effects of electrochemical corrosion reaction on metals, anti-flash corrosion agent is mainly anti-flash chemical corrosion. Liquid corrosion-resistant, salt-resistant spray additives are used to combat the corrosion process of relatively long electrochemical reactions. The chemical composition and function of anti-corrosion agents, liquid anti-corrosion agents and salt mist-resistant additives are different.I. Anti-flash rust agent I. What is called flash rust When the metal material is coated with water-based coating, due to the high concentration of electrolyte aqueous solution and metal substrate of the instantaneous strong electrochemical action, metal ions in the oxidation of oxygen corrosion phenomenon. Similar to the principle of metal corrosion, but this corrosion is produced at a short speed, the metal surface rust is obvious, we call it flash rust.Second, Sypon chemical anti-flash rust technologyanti-flash rust principle: through anti-flash rust additives instantaneously screen closed metal ions or reduce the reaction activity of metal ions, cut off or less oxygen, electrochemical reaction instantaneous weakening or abort.Xipperson anti-flash rust agent selection of small impact on water resistance of organic compounds, metal ions quickly mating chemical reaction, while quickly cutting off the supply of oxygen, after the completion of the flash rust function, residual non-reactive organic small molecules with water evaporation, reducing the impact on paint film resistance.The spectral technology hydrophobic insulation schematic 3, anti-flash rust factors 1. Humidity the greater the humidity, the longer the instantaneous strong electrochemical action time, the more obvious the flash rust.2.the temperature, the faster the electrolyte aqueous solution can be reduced on the metal substrate, the shorter the instantaneous strong electrochemical effect, the less rust.3. Metal substrate chemical compositionthe substrate containing iron, carbon and other easy to form the original battery structure, such as cast iron containing a large amount of carbon, there is a clear original battery structure, resulting in instantaneous electrochemical corrosion effect is more obvious. Buried arc welding flash rust is also due to the chemical composition in the welding rod easy to form favorable electrochemical reaction conditions. The problem of flash rust is more complex.4. Paint type and PH valuewater-based paint resin oxygen-proof energy capacity or formulation of the ability to match, (such as water-based alicic acid resin, itself needs to oxidize into film), metal ions are not easy to be oxidized, flash rust production is not obvious. The pH value of the system is relatively high alkaline, the reaction ability of metal ions is reduced after passivation, and the less rust is produced.Fourth, for water-based industrial paint anti-flash rust performance requirements1, with water-based resin additives and pigments have a wide range of compatible2, low addition, obvious flash rust effect3, water-resistant salt spray impact small 4, strong inhibition of all types of metal substrates 5, temperature and humidity and other conditions affected by small 5, Xi Spectssen anti-rust performance5.1, flash rust effect (application film thickness in cast iron 70um added 1.0%) 5.2, the effect of flash rust agent on paint film water resistance (deionized water 48h) 5.3, buried arc welding integrated anti-flash rust scheme 3% CBA65 plus 0.5% CA50 system PH 9.2

6th, Syspectromson Chemical's anti-flash rust productsanti-flash rust agent CA50 light-colored liquid excellent anti-flash rust, water resistance anti-flash rust agent CA55 light liquid low taste, compatible II., liquid Anti-corrosion agents and salt spray-resistant additives Salt mist resistance performance is an important indicator to evaluate the durability of coating products, the choice of resins and rust-resistant pigments in coating formulations is undoubtedly crucial, but in addition to resins and pigments, the formulation can quickly and efficiently improve the durability of the paint choice is anti-corrosion, salt spray-resistant additives. It will not affect the paint PVC brought about by many problems, and can solve the water-resistant paint, salt-resistant fog, adhesion and other problems. I,
liquid anti-corrosion agent principle of action: contains organic salts of large molecule hydrophobic hydrophobic salts, similar to the phosphate action schematics (phosphate corrosion prevention schematic), will form insoluble iron salt passivation membrane in the cathode, unlike phosphate formed is hydrophosphatate-type inorganic iron salt passivant, liquid corrosion inhibitor formed by organic hydrophosphatlic insoluble insoluble. The electrochemical reaction under the action of electrolyte is further weakened and the corrosion resistance is improved. Application conditions 1.1
with the traditional inorgic phosphate and other anti-rust pigments to use the same amount of 1.2
to replace inorgic anti-rust pigments, the maximum amount of addition is not higher than 3% main functions1, enhance the water resistance of the paint film 2, enhance the salt spray resistance of the paint film 3, enhance the rust-proof pigment containing phosphate Viscosity storage stability, and reduce the amount of thickener use 4, does not affect gloss, does not change PVC 2,
salt spray-resistant additives principle of action: highly active multi-function group hydrophobic chemical structure and metal surface and pigments, fillers / additives form a stereochemical reaction cross-linking, reduce the reaction activity of metal ions, improve the chemical compaction and water resistance of the paint film, reduce the production of electrochemical corrosion, Can significantly improve the paint film resistance, adhesion. Application conditions: highly active multi-energy officer, will produce adverse performance side reactions. This makes the conditions of use of salt-resistant spray additives and the ultimate ideal effect will be relatively different. The following conditions must be taken into account when using. 2.1 system pH effect, too high or too low will accelerate the salt spray-resistant additives of the official energy group self-gathering, three-dimensional reaction is bound to be reduced. 2.2. The rapid response of hydrophobic reaction groups of additives and resins and salt mist-resistant additives is conducive to the efficient use of salt mist-resistant additives, and the responsiveness of resins and additives is very important. 2.3 functional fillers and metal substrate surface and salt-resistant spray additives reactive effects, the formula contains white carbon black, aluminum silicate, mica powder, talcum powder on salt-resistant spray additives have a strong response, while organic pigments and calcium carbonate powders and salt-resistant spray additives reaction activity is weak. Aluminum, steel, iron substrate and salt spray-resistant additives have a better response. 2.4 paint storage temperature and time and construction temperature have an impact on performance. Third, the main functions 1, significantly improve the water resistance of the paint film 2, significantly increase the salt spray time of the paint film3, lift the adhesion of the paint film (illustration) 4, do not change the PVC salt mist aid attachment and substrate reaction principle schematic (enhance adhesion) salt spray aid and pigment and resin reaction Schematic 4
, the effect of added salt mist-resistant additives on adhesion (carbon steel, film thickness 75um) 5
, neutral salt mist resistance performance (single propylene, film thickness 75um cold-rolled steel) 6
, Xipansen corrosion inhibitor, salt mist-resistant additive products Anti-corrosion agent CBA65 dyride yellow liquid partially replaces phosphate pigment salt mist-resistant additive CA70 100% transparent liquid and additive resin strong salt-resistant spray additive CA75 100% transparent liquid adhesion increase is more obvious