Copper strip test

Petroleum products-corrosiveness to copper. Copper strip test... 

General rules for corrosion tests applicable to storage conditions Filiform corrosion test on steel Liquefied petroleum gases-corrosiveness to copper. Copper strip test Road vehicles-brake linings-resistance to water, saline solution, oil and brake fluid-test procedure... 

ASTM coal classification system, 6 710, 712 ASTM coating standards, 9 717 ASTM copper strip test, 23 624 ASTM D 381 chemical stability test,... 

Control of the total sulfur content, hydrogen sulfide, and mercaptans ensures that the product is not corrosive or nauseating. Stipulating a satisfactory copper strip test further ensures control of corrosion. 

Some sulfur compounds can also have a corroding action on the various metals of the engine system, varying according to the chemical type of sulfur compound present. Fuel corrosivity is assessed by its action on copper and is controlled by the copper strip test (ASTM D-130, IP 154), which specifies that not more than a slight stain shall be observed when the polished strip is immersed in fuel heated for 2 h in a bomb at lOO C (212°F). This particular method is not always capable of reflecting fuel corrosivity toward other fuel system metals. For example, service experience with corrosion of silver components in certain engine fuel systems led to the development of a silver corrosion test (IP 227). The mercaptan sulfur content (ASTM D-1219, ASTM D-3227, IP 104, IP 342) of jet fuels is limited because of objectionable odor, adverse effect on certain fuel system elastomers, and... 

Free, or corrosive, sulfur in an appreciable amount could result in corrosive action on the metallic components of an appliance. Corrosive action is of particular significance in the case of pressure burner vaporizing tubes that operate at high temperatures. The usual test applied in this connection is the corrosion (copper strip) test (ASTM D-130, ASTM D-849, IP 154). 

The copper strip test methods are used to determine the corrosiveness to copper of gasoline, diesel fuel, lubricating oil, or other hydrocarbons. Most sulfur compounds in petroleum are removed during refining. However, some residual sulfur compounds can have a corroding action on various metals. This effect is dependent on the types of sulfur compounds present. The copper strip corrosion test measures the relative degree of corrosivity of a petroleum product. 

The copper strip test methods are used to determine the corrosiveness to copper of diesel fuel and are a measure of the relative degree of corrosivity of diesel fuel. Most sulfur compounds in petroleum are removed during refining. However, some residual sulfur compounds can have a corroding action on various metals, and the effect is dependent on the types of sulfur compounds present. One method (ASTM D-130, IP 154) uses a polished copper strip immersed in a given quantity of sample and heated at a temperature for a time period characteristic of the material being tested. At the end of this period the copper strip is removed, washed, and compared with the copper strip corrosion standards (ASTM, 2000). This is a pass/fail test. In another method (ASTM D-849) a polished copper strip is immersed in 200 ml of specimen in a flask with a condenser and placed in boiling water for 30 min. At the end of this period, the copper strip is removed and compared with the ASTM copper strip corrosion standards. This is also a pass/fail test. 

Corrosion of heating equipment can occur if the sulfur oxides formed on combustion of fuel oil are allowed to condense in the presence of moisture on the cooler parts of the flue system. Corrosion of metal parts of the fuel system may also reflect the presence of corrosive sulfur components in the fuel. The corrosive tendencies of the fuel may be detected by the copper strip test (ASTM D-130, ASTM D-849, IP 154), the effect of these sulfur compounds being indicated by discoloration of the copper strip. 

The total quantity of sulfur in a gear oil due to the base oil and the additives present can be determined by a bomb method (ASTM D-129, IP 61) in which the sulfur is assessed gravimetrically as barium sulfate. The copper strip test (ASTM D-130, ASTM D-849, ASTM D-2649, IP 154) is used to simulate the tendency of the oil to attack copper, brass, or bronze. Because active sulfur is desirable for some extreme-pressure applications, a positive copper strip result can indicate that the formulation is satisfactory, but care is necessary in the interpretation of copper strip results because formulations of different chemical compositions may give different results and yet have similar performance in the intended application. Corrosion preventative properties are also measurable (ASTM D-4636). 

Corrosiveness. Sulfur in the fuel facilitates corrosion. The combustion of sulfur containing fuels results in the formation of corrosive gases that attack the engine, the exhaust as well as the environment. Sulfur also adversely affects the alkyl lead octane response. Furthermore, it adversely affects the exhaust catalysts. However, the monolithic catalysts usually recover when the sulfur content of the fuel is reduced. In this case, sulfur is considered to be an inhibitor rather than a catalyst poison. The copper strip corrosion test and the sulfur content specification are used to ensure fuel quality. The copper strip test measures the active sulfur whereas the sulfur content reports the total sulfur present. 

ASTM D 849-97. Standard test method for copper strip corrosion by industrial aromatic hydrocarbons. ISO 2160-98. Petroleum products - Corrosiveness of copper - Copper strip test. 

Petroleum and related products— Determination of the corrosion resistance of water-containing fire-resistant fluids for hydraulic systems Structural steels with improved atmospheric corrosion resistance Liquefied petroleum gases—Corrosiveness to copper—Copper strip test... 

Although neither MDEA nor DEA can remove COS to levels low enough to pass the Copper Strip test, use of a formulated caustic wash downstream of the anune/LPG treater is reported to remove COS to levels significantly less than 1 ppmw (Bacon and Pearce, 1985). The composition of the formulated caustic may be based on technology outlined by Johnson... 

Note 1—For a similar copper strip test applicable to other petroleum products, see Method D 130 and Test Method D 1838. 

Among the special requirements of solvents may be white color low unsaturated and aromatic content for stability high aromatic content for solution of lacquers or synthetic resins or low boiling for rapid volatilization. In general, however, naphthas should be free from acidity, noncorrosive by the copper-strip test, free from gums or suspended matter, sweet smelling so that a petroleum odor is not imparted to the... 

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