Inhibiting paints, corrosion

The empiricism that appears to follow the corrosion engineer arises from the multi-factor, multi-component situations which are present within all common articles of commerce, be they made from iron, aluminum, or more exotic material combinations. The variables are continually interacting in increasingly complex ways so we can become engrossed for even a lifetime with just one problem in performance such as airfoil stress corrosion cracking, boiler feed water stabilizations, or corrosion inhibiting paints, and many more. But does this mean the work lacks for glamour and excitement ... 

Corrosion-inhibiting paint See anti-corrosion paint or composition. 

Corrosion-Inhibiting Paint See Anticorrosion Paint or Composition and Composition. 

Pigment Dispersion. AMP is used widely as a pigment dispersant for water-based paints and paper coatings. In small amounts, it efficiently disperses pigments and improves pH stabiUty, viscosity, corrosion inhibition, and odor (13). When AMP is used in conjunction with other surfactants, enhanced performance is obtained with less of these ingredients in the dispersion. 

Zinc yellow became an important corrosion-inhibiting pigment for aircraft during World War II. However, the war production rate of 11,000 t/yr has not since been reached. Now, 2inc yellow is widely used for corrosion inhibition on auto bodies, light metals, and steel, and in combination with red lead and ferric oxide for stmctural steel painting. 

A conversion coating provides an insulating, often non-conducting coating which both inhibits corrosion once painted and provides a better surface for paint adhesion. 

In general, paint adhesion and salt spray corrosion inhibition of iron phosphate coatings post-treated with polyvinylphenol derivatives have been equal to or superior to that obtained with chromate based systems. This has been the case particularly with many high solids paints. 

In military aerospace vehicles, the service conditions are most severe for paints. One way to increase protecion of aluminum in acidic marine environments is to enhance the corrosion inhibiting ability of the inorganic coating. This paper describes the results of such an effort. A new coating which not only inhibits the attacic of chloride ions but also that of the acidic environments such cis SO2 has been developed. 

CORROSION INHIBITION. See Anlodeposldon Conversion Coatings Paint and Finish Removers Petroleum. 

Zinc chromate (ZnCr04), also known as zinc yellow (with the approximate formula 4Zn0K204Cr03-3H20), is used as a pigment because of its excellent corrosion-inhibiting effect both in mixed paints and as a priming coat for steel and aluminum. 

ISO 1249 - Zinc chromate pigments - Basic zinc potassium chromate pigments and zinc tetrahydroxychromate pigments - specifies the requirements, and corresponding test methods for zinc chromate pigments suitable for use in paints and/or corrosion-inhibiting coatings [5.59]. 

SAFETY PROFILE Solutions in methanol are sensitive explosives when no moisture is present. When heated to decomposition it emits toxic fumes of Cl" and Pb. Used as a corrosion-inhibiting pigment in primers and paints, and in making storage batteries. See also LEAD COMPOUNDS and PERCHLORATES. 

Practical evidence of the corrosion-inhibiting properties of epoxy-polyamide paints was provided by Glaser and Floyd (35). who showed by Florida tidewater exposure tests on steel substrates that these paints offer protection equal to and in most cases better than paints containing corrosion-inhibiting pigments. 

Agent 765. [VifitcoSA] Fatty amine salt corrosion inhibiter, i gment grinding and dispersion aid antistrippbg agent for paints. 

Amphoteric. [Exxon/Tomah] Amphoterics detergent foam boostm/stabi-lizet wetting agent coupler for liq. detergents defoamer for paints corrosion inhibits in metalworking lubricants leather lubricant... 

Chromates Tanning/paints/pigments/corrosion inhibition/fungicides Skin ulcersAcidney inflammation/jpossibly carcinogenicAoxic to fish... 

Rewtmiine. [RewoGmbH] hnidazolines corrosion inhibit, emulsifier, penetrant, wetting agent used in leather and mrtalworidng in stiy, paint and dyes, for carbonization batte. 

The review of inhibited paint coatings would be incomplete without mentioning coatings with Cl that inhibit biological corrosion. Microbiologically influenced corrosion is the deterioration of a metal by a corrosion process that occurs either directly or indirectly as a result of the activity of living organisms [85]. 

Pigments, dyes, and extenders are defined in DIN 55943 under the heading colorants (coloring materials). Further standards are DIN 55944 and 55949. Similar definitions are given in ASTM D16-84, IS0 4617, and IS0 4618. A pigment is defined as a substance that is insoluble in the application medium (e.g., a paint) and is used as a colorant or on account of its corrosion-inhibiting or magnetic properties. A dye is defined as a colorant that is soluble in the application medium. 

---