Corrosion resistance, improvement

A minimum chromium concentration of approximately 11% is typical for stainless steel. As more chromium is added, corrosion resistance improves. Concentrations of chromium >20% are found in some alloys. Chromium addition leads to the formation of a tight-forming oxide film on the surface of the metal. This stable film is self-healing, which means that the film will reform if scratched or broken. This oxide is quite resistant to attack by acids, bases, organic compounds, and inorganic salts. [Pg.222]

L Mo for corrosion resistance Improve tensile strength of constructed materials... [Pg.223]

Tool coatings/platings are typically used to enhance tool performance in one or more of the following areas wear resistance, corrosion resistance, improved tool release, resizes components, and/or their combination. No single treatment is ideal for solving all these problems. Treatments are used that resist the corrosion damage inflicted by chemicals such as hydrochloric acid when processing PVC, formic acid or formaldehyde with acetals, and oxidation caused by interaction between tools and moisture in the plant atmosphere. Release problems require treatments that decrease friction and increase lubricity in mold cavities.3... [Pg.519]

Chem. Descrip. p-Toluene sulfonic acid in methanol Uses Blocked catalyst imparting hardness, gloss, humidity, and corrosion resist., improved mechanical props, for thermoset high solids and waterborne coatings... [Pg.553]

Nano-clay incorporated polymer coatings are important for modifying properties of surfaces. Nano-clay incorporated thermoset polymer nanocoatings exhibit superior properties such as super-hydrophobicity, improved wettability, excellent resistance to chemicals, corrosion resistance, improved weather resistance, better abrasion resistance, improved barrier properties and resistance to impact, scratches, etc. [116]. The parameters such as dipping time, temperature, nature of surfactant, and purity of nanomaterials decides the coating thickness. Clay-epoxy coating... [Pg.340]

Crevice corrosion resistance improves with molybdenum additions, and a chloride crevice corrosion test (5% NaCl at 90 °C, pH adjusted to 0.5 and 1.0) indicated a chloride crevice corrosion threshold between pH 0.5 and 1.0. [Pg.554]

Zinc- or cadmium-electroplated steel articles are frequently passivated with a chromate coating in order to enhance corrosion resistance, improve solder-ability and provide a pleasing (e.g. iridescent) finish. [Pg.441]

Guo LF, Yue TM, Man HC, (2005), Excimer laser surface treatment of magnesium alloy WE43 for corrosion resistance improvement . Journal of Materials Science, 40, 3531-3533. [Pg.261]

The two main wrought copper-nickel alloys chosen for seawater service contain 10 and 30% percent nickel, respectively. When comparing international specifications, the compositional ranges of the two alloys vary slightly between specifications, as can be seen in Tables 8.15 and 8.16 for 90-10 and 70-30 copper-nickel alloys. In practice, these variations have little influence on the overall service performance of the alloys. Iron is essential for both alloys because it provides added resistance to corrosion caused by velocity effects called impingement attack. An optimum level is between 1.5 and 2.5% iron, probably as a result of solid solubility. The corrosion resistance improves with increasing iron so long as it remains in solid solution. The specification limits for alloys were set by this observation. [Pg.650]

For example,copper has relatively good corrosion resistance under non-oxidizing conditions. It can be alloyed with zinc to yield a stronger material (brass), but with lowered corrosion resistance. Flowever, by alloying copper with a passivating metal such as nickel, both mechanical and corrosion properties are improved. Another important alloy is steel, which is an alloy between iron (>50%) and other alloying elements such as carbon. [Pg.923]

Other authors have attributed the improved corrosion resistance with increasing Cr content with the increasing tendency of the oxide to become more disordered [69]. This would then suggest that an amoriDhous oxide film is more protective than a crystalline one, due to a bond and stmctural flexibility in amoriDhous films. [Pg.2725]

Water—Glycol Solutions. These materials are transparent solutions of water and glycol having good low temperature properties. They frequently contain water-soluble additives to improve performance in corrosion resistance, anti-wear, etc. A water-soluble polymer is commonly utilized to boost viscosity. As solutions their advantage over emulsions is their inherent stabdity. [Pg.263]

Optimum surface roughness usually is 0.05—0.5 pm a very smooth surface contains very Htde lubricant within its depressions, whereas rough peaks penetrate the lubricant to promote wear. Improved corrosion resistance may be obtained with a suitable subcoating surface conversion treatment or by inclusion of inhibitors in the coating. [Pg.251]

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