Flash rust inhibitors, coatings

Emulsion systems for anticorrosive coatings are usually copolymers of vinylidene chloride, vinyl chloride, and an alkyl acrylate or methacrylate. Relatively small amormts of surfactant and colloid are used in order to minimize water sensitivity in the dried coating. Flash rusting inhibitors such as ammonium chromate/dichromate or alkali metal nitrate/nitrites may also be added. 

Chem. Descrip. Ammonium benzoate CAS 1863-63-4 EINECS/ELINCS 217-468-9 Uses Rust inhibitor for aq. industrial coatings, latex emulsion primers, waterborne lacquers, water-reducible alkyds and epoxies Features Flash rust inhibitor cost-effective Properties Off-wh. cryst. sp.gr. 1.76 dens. 10.48 Ih/gal bulking value 0.095 gal/lb m.p.198C Use Level 0.1-0.5%... 

Flash rusting is the phenomenon of formation of small brown rust spots that appear very soon after application of waterbased systems directly to steel. The problem is more prominent when the steel surface is active (for example, after blasting) and the pH is <7. To combat this problem, flash-rust inhibitors are added to waterbased coatings. They should have good water solubility. Flat surfaces are relatively easy to protect, while weld areas are considered difficult. Flash-rust inhibition at a weld area can be achieved by a combination of different products. Flash-rust inhibitors are typically based on ammonium and sodium nitrites, benzoates, metaborates and phosphates, occasionally in combination with materials such as morpholine and amino methyl propanol. Some other organic salts are also used, such as amine salts of 2-mercaptobenzothiazolyl succinic acid and calcium or barium salts of linear alkyl naphthalene sulfonic acids. Typically they are used at levels of 0.1 to 1.0 % of the total mass of paint. They also help in preventing in-can corrosion upon storage of aqueous paint. 

The main binder resin is usually an acrylic or styrene/acrylic emulsion. Water is the carrier solvent. Plasticiser is added to lower the MFFT of the coating. Glycol ethers improve the coalescence. Aqueous sodium nitrite solution acts as a flash rust inhibitor. 

Uses Corrosion inhibitor for in-can and flash rust control for water-based coatings... 

Uses Corrosion/rust inhibitor in water-based protective coatings inhibits flash rust and In-can rusting stabilizes metal substrates for water blasting... 

Chem. Descrip. Diethanolamine-free alkanolamine alkanoate Uses Corrosion inhibitor for aq. systems, metalworking and lubricant industries resist, against flash rusting in cleaning and metalworking applies, and in latex paint coatings... 

Chem. Descrip. Barium sulfonate in mineral spirits Uses Rust/corrosion inhibitor for prevention of flash rusting and staining in latex coatings increases corrosion resist, of alkyd and alkyd/melamine coatings... 

Uses Rust/corrosion inhibitor for prevention of flash rusting in latex coatings rust and corrosion inhibitor for solv.-based coatings Properties Dens. 7.7 Ib/gal flash pt. (Seta) 108 F 2.1% metal UseLevei 0.25-3.0%... 

Uses Rust/corrosion inhibitor for water-based paints/coatings, water-based industrial primers, water-reducible alkyds Features Flash rust/in-can corrosion inhibitor nitrite-free provides belter dried film corrosion protection than water-sol. salts Properties Yel. clear liq. disp. in water sol. in glycol ether, insol. in min. spirits sp.gr. 1.06 dens. 1040 kg/m bulk dens. 8.83 Ib/gal vise. 200 mPa s max. flash pt. > 52 C pH 8.0-10.0 anionic Use Level 0.1 -0.6% (on total formulation wt.)... 

Uses Corrosion inhibitor for waterborne coatings on ferrous surfe., e.g., metal primers, flat or gloss disp. paints, polyacrylics, polyvinyl acetates, PS acrylics and terpolymers, waterborne alkyds, aq. stoving enamels temporary rust inhibitor for metal surfs. in-can corrosion inhibitor, esp. under acid conditions Features Fights flash rusting... 

Chem. Descrip. Barium alkylarylsulfonate in propyiene giycoi n-butyi ether Uses Corrosion inhibitor for ferrous metais used in gioss waterborne iatex coatings prevents flash rusting of waterborne iatex coatings Features No ozone-depieting substances Properties Dk. brn. iiq. soi. or misc. in min. spirits, n-butanoi, xyiene, MiBK, toiuene insoi. in water, acetone, ethyiene giycoi sp.gr. 1.00 dens. 8.20 ib/gai vise. 150 cps VOC 492 g/i 50% act. by wt. 44% act. by voi. Use Levei 1 -5%... 

Chem. Descrip. Zinc sulfonate in ethylene glycol monobutyl ether Uses Rust/corrosion inhibitor in solv., water, and high solids coatings at low bake temps, can also act as a catalyst for crosslinking amino resins Properties Dens. 8.29 Ib/gal flash pt. (Seta) 110 F 50% act. 3.3% metal Nacorr 1651 [King Ind.)... 

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