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Corrosion corrosivity tests

The state of the art in 1987 was published in Survey of standards, technical rules and regulations in the area of corrosion, corrosion testing and corrosion protection, together with the most important DIN standards and some other regulations in the DIN 219 [71]. A commentary on these standards has also appeared [72]. [Pg.24]

Nickel-based alloys-Determination of resis-ance to intergranular corrosion Corrosion tests in artificial amospheres at very low concentrations of polluting gas(es) Test /. .-sulphur dioxide test for contacts and connectors... [Pg.1105]

Little, B. J., Wagner, P. A., ind Mansfeld, F., "Microbiologically Influenced Corrosion, Corrosion Testing Made Easy, B. C. Syrett, Series Ed., Vol. 5, NACE International, Houston TX, 1997. [Pg.520]

Corrosion of metals and alloys—Corrosivity of atmospheres—Guiding values for the corrosivity categories Corrosion of metals and alloys—Corrosivity of atmospheres—Measurement of pollution Corrosion of metals and alloys—Corrosivity of atmospheres—Determination of corrosion rate of standard specimens for the evaluation of corrosivity Corrosion tests in artificial atmospheres—Salt spray tests Nickel-based alloys—Determination of resistance to intergranular corrosion Corrosion of aluminium alloys—Determination of resistance to stress corrosion cracking Corrosion tests in artificial atmosphere at very low concentrations of polluting gas(es)... [Pg.858]

Finally, other tests to control jet fuel corrosivity towards certain metals (copper and silver) are used in aviation. The corrosion test known as the copper strip (NF M 07-015) is conducted by immersion in a thermostatic bath at 100°C, under 7 bar pressure for two hours. The coloration should not exceed level 1 (light yellow) on a scale of reference. There is also the silver strip corrosion test (IP 227) required by British specifications (e.g., Rolls Royce) in conjunction with the use of special materials. The value obtained should be less than 1 after immersion at 50°C for four hours. [Pg.251]

If sulfur is a contaminant, its content can be measured, but it may suffice to characterize its effects by the copper strip corrosion test, or by the doctor test". [Pg.274]

Performance can be illustrated for example by the time necessary for deaeration or de-emulsification of oils, anti-rust properties, copper strip corrosion test, the flash point in closed or open cup, the cloud and pour points, the foaming characteristics, etc. [Pg.285]

Nondestructive Cracks and Corrosion Testing by Eddy Current Method. [Pg.283]

Specifications for the principal LPG products are summarized in Table 4. Detailed specifications and test methods for LPG are pubHshed by the Gas Processor s Association (GPA) (3) and ASTM (4). The ASTM specification for special-duty propane and GPA specification for propane HD-5 apply to propane that is intended primarily for engine fuel. Because most domestic U.S. LPG is handled through copper tubing, which could fail if corroded, all products must pass the copper strip corrosion test. A test value of No. 1 represents a LPG noncorrosive to the copper. [Pg.186]

Recommended Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens," specification Gl, Annual Book ofASTM Standards, American Society for Testing and Materials, Philadelphia, Pa., 1992. [Pg.337]

Carbonyl sulfide reacts with chlorine forming phosgene (qv) and sulfur dichloride [10545-99-0] and with ammonia forming urea and ammonium sulfide [12135-76-1]. Carbonyl sulfide attacks metals, eg, copper, ia the presence of moisture and is thought to be iavolved ia atmospheric sulfur corrosion (27,28). Its presence ia propane gas at levels above a few ppm may cause the gas to fail the copper-corrosion test. [Pg.130]

Vanadium is resistant to attack by hydrochloric or dilute sulfuric acid and to alkali solutions. It is also quite resistant to corrosion by seawater but is reactive toward nitric, hydrofluoric, or concentrated sulfuric acids. Galvanic corrosion tests mn in simulated seawater indicate that vanadium is anodic with respect to stainless steel and copper but cathodic to aluminum and magnesium. Vanadium exhibits corrosion resistance to Hquid metals, eg, bismuth and low oxygen sodium. [Pg.382]

Attack on metals can be a function of fuel components as well as of water and oxygen. Organic acids react with cadmium plating and 2inc coatings. Traces of H2S and free sulfur react with silver used in older piston pumps and with copper used in bearings and brass fittings. Specification limits by copper and silver strip corrosion tests are requited for fuels to forestall these reactions. [Pg.416]

The acid wash test consists of shaking a mixture of 96% sulfuric acid with benzene and comparing the color of the (lower) acid layer with a set of color standards. Other quaUtative tests include those for SO2 and H2S determination. The copper strip corrosion test indicates the presence of acidic or corrosive sulfur impurities. The test for thiophene is colorimetric. [Pg.46]

Table 4. Plant Corrosion Test in Sulfuric Acid Dilution with Recirculated Phosphoric Acid ... Table 4. Plant Corrosion Test in Sulfuric Acid Dilution with Recirculated Phosphoric Acid ...
There is no meaningflil correlation between laboratory corrosion tests and clinical performance, but high in vitro corrosion rates on several high nickel dental prosthetic alloys (163), together with the prevalence of allergy to nickel caused by plated jewelry, gives cause for caution. [Pg.485]

Corrosion test methods, useful for comparison purposes, usually have no correlation to actual corrosion resistance in atmospheric exposure. [Pg.151]

Sa.lt Spray Tests. One of the older accelerated corrosion tests is the salt spray test (40). Several modifications of this imperfect test have been proposed, some of which are even specified for particular appHcations. The neutral salt spray test persists, however, especially for coatings that are anodic to the substrate and for coatings that are dissolved or attacked by neutral salt fog. For cathodic coatings, such as nickel on steel, the test becomes a porosity test, because nickel is not attacked by neutral salt fog. Production specifications that call for 1000 hours salt spray resistance are not practical for quahty acceptance tests. In these cases, the neutral salt spray does not qualify as an accelerated test, and faster results from different test methods should be sought. [Pg.151]

The CASS Test. In the copper-accelerated acetic acid salt spray (CASS) test (42), the positioning of the test surface is restricted to 15 2°, and the salt fog corrosivity is increased by increasing temperature and acidity, pH about 3.2, along with the addition of cupric chloride dihydrate. The CASS test is used extensively by the U.S. automobile industry for decorative nickel—chromium deposits, but is not common for other deposits or industries. Exposure cycle requirements are usually 22 hours, rarely more than 44 hours. Another corrosion test, now decreasing in use, for decorative nickel—chromium finishes is the Corrodkote test (43). This test utilizes a specific corrosive paste combined with a warm humidity cabinet test. Test cycles are usually 20 hours. [Pg.151]

The Electrolytic Corrosion Test. Also developed for use on nickel—chromium and copper—nickel—chromium decorative automobile parts is the electrolytic corrosion (EC) test (44). Plated specimens or parts are made anodic in a corrosive electrolyte under controlled conditions for 2 min, and then tested for penetration to the substrate. [Pg.151]

Deflagration Arrester Testing For end-of-line and tank vent flame arresters, approval agencies may require manufacturers to provide users with data for flow capacity at operating pressures, proof of success during an endurance burn or continuous flame test, evidence of flashback test results (for end-of-hne arresters) or explosion test results (for in-line or tank vent arrester applications), hydrauhc pressure test results, and results of a corrosion test. [Pg.2304]

General References Ailor (ed.), Handbook on Corrosion Testing and... [Pg.2417]

There is no standard or preferred way to cany out a corrosion test the method must be chosen to suit the purpose of the test. The principal types of tests are, in decreasing order of rehability ... [Pg.2425]

Metals and alloys do not respond alike to aU the influences of the many factors that are involved in corrosion. Consequently, it is impractical to establish any universal standard laboratoiy procedures for corrosion testing except for inspection tests. However, some details of laboratory testing need careful attention in order to achieve useful results. [Pg.2425]

A circular specimen of about 38-mm (I.5-iu) diameter is a convenient shape for laboratory corrosion tests. With a thickness of approximately 3 mm Vh in) and an 8- or Il-mm- (yi6- or Vifi-in-) diameter hole for mounting, these specimens will readily pass through a 45/50 ground-glass joint of a distiUation kettle. The total surface area of a circular specimen is given by the equation ... [Pg.2425]

FIG. 28-3 Laboratory-equipment arrangement for corrosion testing. (Based on NACE Standard TM0169-95.)... [Pg.2426]

FIG. 28-4 Laboratory setup for the corrosion testing of heat-transfer materials. [Pg.2426]

Whatever treatment is used to clean specimens after a corrosion test, its effect in removing metal should be determined, and the weight loss should be corrected accordingly. A blank specimen should be weighed before and after exposure to the cleaning procedure to estabhsh this weight loss. [Pg.2427]

Effect of Variables on Corrosion Tests It is advisable to apply a factor of safety to the results obtained, the factor varying with the degree of confidence in the applicabihty of the results. Ordinarily, a factor of from 3 to 10 might be considered normal. [Pg.2428]


See other pages where Corrosion corrosivity tests is mentioned: [Pg.353]    [Pg.49]    [Pg.673]    [Pg.73]    [Pg.176]    [Pg.450]    [Pg.450]    [Pg.186]    [Pg.443]    [Pg.223]    [Pg.112]    [Pg.50]    [Pg.431]    [Pg.284]    [Pg.537]    [Pg.156]    [Pg.157]    [Pg.2415]    [Pg.2415]    [Pg.2416]    [Pg.2416]    [Pg.2420]    [Pg.2424]    [Pg.2425]    [Pg.2425]    [Pg.2425]    [Pg.2425]    [Pg.2427]   
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