Acid Resistance

Acid Resistance


the ability of materials to resist the destructive effect of acids.

Acid resistance depends on the nature of the material, the redox properties of the medium, the nature of the anions, and the concentration and temperature of the acids. For example, chromium and chromium steels are stable in 40 percent nitric acid but undergo rapid corrosion in 40 percent sulfuric acid. The acid resistance of materials decreases with temperature. It is important to differentiate between acid resistance in liquid and vapor-gas phases and at the boundary of the two. The acid resistance of metallic materials is determined by loss of mass per unit area (9 per sq m per hr). The acid resistance of nonmetallic organic materials is gauged according to the degree of swelling and the change in mechanical properties (strength, yield point, ultimate elongation). The acid resistance of nonmetallic inorganic materials is determined by the change in mass of the pulverized material after acid treatment.


acid resistance

The degree to which a surface, such as porcelain enamel, will resist attack by acids.
References in periodicals archive ?
The various grades show good acid resistance, as has been tested extensively with citric acid, and the viscosity loss was modest at 25 [degrees] C.
E Wall Mounting Type Tool Board Of Suitable Material And Protected Against Acid Fumes Having Acid Resistance Painting Size-1.
Detection of nalidixic acid resistance as a predictor for decreased fluoroquinolone susceptibility in salmonellae has been reported (15, 16).
Baryte high-specific-gravity filler can be used for sound abatement and acid resistance, and in foams and plastics where weighting properties are needed.
They provide the user with benefits such as acid resistance as well as washability.
3) Low temperature brittle point - [degrees]F -70 -70 -60 [degrees]C -57 -58 -51 Resilience G to E P G Compression set G F G Heat aging E G to E G Abrasion resistance G G G Tear strength P G F Flame retardant properties P P P Weathering characteristics E G to E F to P Oxidation resistance E E G Ozone resistance E G to E F Oil resistance P P E Acid resistance E E G Alkali resistance E E G Key characteristics/ Ozone re- Low gas Oil and comments sistance perme- fuel good ex- ability resis- tendability tance Typical wire and Engine Tapes Mining cable usage ignition for ship/ cable cable and marine jacket portable (w/PVC cord insu- modi- lation fiers) General-purpose elastomers Properties Poly- Styrene chloro- butadiene prene rubber ASTM designation CR SBR Durometer A 40-90 40-90 Sp.
Dental enamel seems to have increased acid resistance following irradiation with the Er, Cr:YSGG laser.
Effect of Nano-Silica on Acid Resistance Properties of Enamel and Its Connection to Energy Saving (Majid Jafari and Javad Sarraf)
Additional characteristics include a class 1 integron containing the dfrA1 cassette, a gyrA mutation that mediates nalidixic acid resistance and furthers resistance to nitrofurantoin.
Responses included coating viscosity, cured film glass transition temperature, gloss, hardness, flexibility, acid resistance, and Florida weathering over a three and a half year period.
Inorganic bases such as litharge or dibasic lead phosphite may improve acid resistance to some specific acid types.