ISO 11007-1 pdf download – Petroleum products and lubricants —Determination of rust-prevention characteristics of lubricating greases- Part 1: Dynamic wet conditions.
7.3 Test fluid, use one of the following types:
a) water conforming to grade 2 of ISO 3696. or
b) synthetic sea water conforming to the specification given in 150 7120, or
c) a 0,S mol/l solution of sodium chloride prepared using water conforming to grade 2 of ISO 3696. at a pH oiO,0 to 8,2. by titration with sodium hydroxide solution.
NOTE Water quality of water used as a test fluid is critical and therefore is a different grade from that specified In 22.
Other water types may be used In this test, although the precision when using other water types has not been determined. It is recommended that the pH of other water types is determined before use.
7.4 Propan-2-ol,
7.5 AmmonIa solutIon, 3.2 % (rn/rn) (1.65 mol/1).
NOTE The ammonia solution is equivalent to a tenfold dilution 0135 % ammonia solution (p = 880 kg/rn’) with water conforming to grade 3 of ISO 3696. ThIs ammonia concentration Is critical to the results of the test.
7.6 Solvent rinse solution, consisting of nine volumes of propan.2ol (7.4) mixed with one volume of ammonia solution (7.5).
7.7 Silver nitrate solution, 0.1 mol/l.
B Preparation of the apparatus
8.1 Remove all traces of grease from previous tests by wiping the plummer blocks housing (see Ad).
Wash the plummer blocks housing and all other parts In solvent rinse solution (2.6) followed by water
(72). Dry thoroughly using a cloth (6.7).
Where previous tests have been carried out with either synthetic sea water L22.b)i or salt water I2.ic)I, pour a few drops of silver nitrate solution (2.2) into the plummerblock. Withdraw a sample
of the silver nitrate solution using a clean pipette, and inspect for milkiness or a white precipitate. If a white precipitate appears, rinse the plummer-block with hot water (72) and repeat this washing until a withdrawn sample is clear.
8.2 Wear protective gloves (6.8) or use tweezers (6.6) for all subsequent handling. l)o not touch the bearings with bare fingers. Use two new bearings for each Lest.
8.3 Number the bearings on the outside diameter of the outer ring but do not use acid etching.
A vibro penn or etching marker maybe used.
8.4 Wash the bearings in wash solvent (7.1.) at 50°C to 65 °C, to remove the rust-preventative.
Repeat the wash using fresh portions of hot wash solvent until the rust-preventative has been completely removed. In cases of dispute, white spirit (see NOTE to 7.1) is the referee solvent.
IMPORTANT — The complete removal of the rust-preventative is critical to the precision of this method. Failure to remove the material wholly will invalidate results.
8.5 Transfer the bearings from the wash solvent to the solvent rinse solution (7.6) to remove any solvent remaining. Rinse the bearings and rotate the outer ring slowly relative to the inner ring, while the bearing Is Immersed In freshly made solvent rinse solution heated to a minimum of 65 C.
To assist in estimating percentage corrosion area, a transparent grid divided into suitable squares maybe used.
NOTE The various ratings are illustrated in Annex B. In all cases, the area referred to represents the wholeof the track.
11.2 If the two ratings do not agree within the precision given for repeatability, carry out two furtherdeterminations.If the two further determinations still do not agree within the precision for repeatability,record both results as the worst degree of rusting obtained, i.e. the highest numerical rating obtained.
12 Precision
12.1 General
The precision of the method, as obtained by statistical examination of interlaboratory test results, isgiven in 12.2 and 12.3.
12.2 Repeatability, r
The difference between two independent results obtained using this method for test materialconsidered to be the same in the same laboratory, by the same operator using the same equipmentwithin short intervals of time, in the normal and correct operation of the method that is expected to beexceeded with a probability of 5 % due to random variation, is shown in Table 2.
12.3 Reproducibility, R
The difference between two independent results obtained using this method for test materialconsidered to be the same in different laboratories,where different laboratory means a differentoperator, different equipment, different geographic location, and under different supervisory control,in the normal and correct operation of the test that is expected to be exceeded with a probability of 5 %due to random variation, is shown in Table 2.
ISO 11007-1 pdf download – Petroleum products and lubricants —Determination of rust-prevention characteristics of lubricating greases- Part 1: Dynamic wet conditions
