ASTM D7095-17 pdf download.Standard Test Method for Rapid Determination of Corrosiveness to Copper from Petroleum Products Using a Disposable Copper Foil Strip.
4. Significance and Use
4.1 Crude petroleum contains sulfur compounds, most of which are removed during refining. However, of the sulfur compounds remaining in the petroleum product, some can have a corroding action on various metals, including copper, and this corrosivity is not necessarily related to the total sulfur content. The effect can vary according to the chemical types of sulfur compounds present. This copper foil strip corrosion test is designed to assess the relative degree of corrosivity of a petroleum product towards copper and copper-containing al- loys using a shorter test duration than that specified in Test Method D130.
4.2 Some sulfur species may become corrosive to copper only at higher temperatures. Thus, higher test temperatures, particularly 100 °C (212 °F), may be used to test some prod- ucts by the pressure vessel procedure.
5. Apparatus
5.1 Copper Foil Strip Corrosion Test Pressure Vessel, constructed from stainless steel according to the dimensions given in Fig. 1. The vessel shall be capable of withstanding a test pressure of 700 kPa gauge (100 psi). Alternative designs for the vessel’s cap and synthetic rubber gasket may be used provided that the internal dimensions ofthe vessel are the same as those shown in Fig. 1. The internal dimensions of the pressure vessel are such that a nominal 25 mm by 150 mm (1 in. by 6 in.) test tube can be placed inside the pressure vessel.
5.2 Test Tubes, of borosilicate glass with nominal dimen- sions of 25 mm by 150 mm (1 in. by 6 in.). The internal dimensions shall be checked as acceptable by use of a copper foil strip (see 6.3). When 30 mL of liquid is added to the test tube with the copper foil strip in it, a minimum of 5 mm of liquid shall be above the top surface of the copper foil strip.
5.3 Test Baths:
5.3.1 General—All test baths, whether liquid or solid block, shall be capable of maintaining the test temperature to within 61 °C (2 °F) of the required test temperature, for the entire duration of the test.
5.3.2 Bath(s) Used for Submerging Pressure Vessel(s)— Bath(s) shall be deep enough to submerge one or more pressure vessels (see 5.1) completely during the test. It shall be fitted with suitable supports to hold each pressure vessel in a vertical position when submerged.
5.3.3 Bath(s) Used for Test Tubes—Bath(s) shall be fitted with suitable supports to hold each test tube (see 5.2) in a vertical position to a depth of about 100 mm (4 in.) as measured from the bottom of the test tube to the bath surface. As a liquid bath medium, water and oil have been found satisfactory and controllable at the specified test temperature and duration required by the test procedure. Solid block baths shall meet the test temperature control, test duration, and immersion conditions required by the test procedure, and shall be checked for temperature measurement (heat transfer) for each product class by running tests on tubes filled with 30 mL of product plus a copper foil strip of the given nominal dimensions, plus a temperature sensor.ASTM D7095 pdf download.