Flash-rust inhibitors

Uses Corrosion inhibitor for copper, high copper alloys, aluminum, steel, cobalt, and silver for use In aq. systems, metalworking fluids, metal cleaners, metallic pigments, flash rust Inhibitors, direct treatment, and cooling towers... 

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%... 

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. 

Flash-rust inhibitors (temporary corrosion protection)... 

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. 

Antiskinning Agents Corrosion Inhibitors Flash Rust Inhibitors... 

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. 

Disperse the titanium dioxide 2190 ( Ex Kronos) in Orotan 165 (Rohm Haas, anionic dispersant) and Disperse Ayd W22 (Daniel Products, surfactant), with water as carrier. Antifoam (Byk 035 from Byk Chemie) and flash rust inhibitor (Emadox NA from Labema) are added. When dispersed, add the pigment paste to the let down mix. Add butyl benzyl phthalate plasticiser and Dehydran 1293 (modified polysiloxane defoamer from Henkel, to reduce foam formation on application) and mix well. Adjust viscosity with water. Neocryl A633 is a 42%nvc acrylic/styrene dispersion from Zeneca. Silwet L-77 (Osi) is a nonionic silicone surfactant to improve wetting. 

Often after fabrication, metal surfaces are protected by oils or a rust preventative to minimize the reaction of the surface with the environment. For example, an oxide-free tool steel surface will form flash rust immediately on exposure to the atmosphere. To prevent the flash rust a flash rust inhibitor is absorbed on the surface before the cleaned surface is allowed to dry. These additives may act as contaminants in further processing and often are removed by in situ cleaning in the deposition system. 

When cleaning iron or steel a flash rust inhibitor in the rinse step may be used to prevent formation of a porous oxide. 

In some cases an additive may be added to the final rinse. For instance, a flash rust inhibitor may be added when cleaning steel. Acetic acid may be added to remove the stain on electroplated chromium when chromium is used as a basecoat. 

Corrosion inhibitors are used to prevent the formation of corrosion products when waterborne paints are applied to metallic substrates (flash rust). They include oxidiz-... 

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%... 

Chem. Descrip. Blend of contact and vol. water sol. conosion inhibitors Uses Corrosion inhibitor that prevents flash rusting in direct to metal applies, in PVA, acrylic, and water-based systems Properties Sp.gr. 1.08 dens. 9.0 0.1 Ib/gal vise. 5-10 mPa-s pH 9.5 ... 

Features Flash rust/in-can corrosion inhibitor provides belter dried film corrosion resist. 

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%... 

Properties Colorless to yel. liq. dens. 0.895 b.p. 200 C flash pt. 190 F ref. index 1.4995-1.5015 Toxicology Irritant TSCA iisted Precaution Combustibie Uses Organic intermediate rust inhibitor Manuf/Distrib. Aidrich http //www.sigma-aldrich.com] Fiuka http //www.sigma-aldrich.com] Salor Seal Sands Chems. Ltd http //WWW.rutherfordchemicals.com] Zeeland http //WWW. rutherfordchemicals. com Trade Name Synonyms BIPA f [Seal Sands Chems. Ltd... 

CH3(CH2)7CH=CH(CH2)7C00CH2CH(CH3)2 Properties Yel. liq. misc. with paraffin oil insol. in water m.w. 338.58 dens. 0.86 kg/l (20 C) pour pt. -21 C flash pt. (COC) 195 C Uses Chemical intermediate chemical synthesis carbon source in antibiotic culture broths lubricity improvers in min. oils lubricant in metalworking fluids, cutting, lamination, and textile oils, rust inhibitors textile and leather industry emollient, emulsifier, bodying agent in cosmetics and... 

An important question in the area of wet blasting is does the flash rust, which can appear on wet-blasted surfaces, have any long-term consequences for the service life of the subsequent painting A possible preventative for flash rust is adding a corrosion inhibitor to the water. 

McKelvie [11] does not recommend inhibitors for two reasons. First, flash rusting is useful in that it is an indication that salts are still present on the steel surface and second, he also points out that inhibitor residue on the steel surface can cause blistering. 

The entire debate over inhibitor use may be unnecessary. Igetoft [12] points out that the amount of flash rusting of a steel surface depends not only on the presence of water but also very much on the amount of salt present. The implications of his point seem to be this if wet blasting does a sufficiently good job of removing contaminants from the surface, the fact that the steel is wet afterward does not necessarily mean that it will rust. 

This technique is effective at removing paint but cannot remove mill scale and heavy corrosion. In addition, the quality of the cleaning may not be suitable for some paint systems, unless the surface had been previously blast-cleaned. If bare steel is exposed, inhibitors may be necessary to prevent flash rusting. 

When water-based paints are applied over exposed ferrous metal, the drying film may develop a scatter of light brown spots. This "flash" rusting is prevented with alkaline inhibitors, such as sodimn nitrite, sodium benzoate, or 2-amino-2-methylpropan-l-ol (AMP). Alkaline minerals, wollastonite in particular, are also used to control flash rusting. 

Corrosion inhibitors are added to surfaces where the clean surface will react with the ambient in an undesirable way. Eor example, after cleaning tool steel, flash rust will form on the surface if a corrosion inhibitor is not added to the surface. Corrosion inhibitors can operate by adsorption of a molecular species on the surface to prevent oxidation or by forming a protective barrier that excludes oxygen from the surface. 

Uses Detergent wetting agent rust inhibitor hydrophobing agent chem. intermediate plasticizer mold release agent extender Properties Gardner 3 max. liq. characteristic odor insol. in cold water sp.gr. 0.83 vise. 8 mPas 30 C vapor pressure < 1 mm Hg m.p. 5 C b.p.> 38 C acid no. 0.15 max. pour pt. 10 C flash pt. > 149 C 0.5% max. moisture 0.6% free fatty acid... 

Uses Detergent, rust Inhibitor, and boundary lubricant for hydraulic fluids, stationary diesel lubricants, soluble oils, cutting fluids, and mst preventive oils Features Exhibits a low level of reactivily In formulations compat. with mineral base oils, white oils, and synthetic base slocks Properties Sp.gr. 0.960 (15 C) vise. 55 cSf (100 C) flash pt. (COC) 220 C Use Level 0.5-10% by wt Storage Store 60-80 C Calcium Caseinate R [DMV Infl.]... 

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