RU2005134335A - METHOD FOR ESTIMATING EFFECTIVENESS OF ACTION OF METAL CORROSION INHIBITORS AND THEIR ALLOYS - Google Patents

Claims (1)

A method for evaluating the effectiveness of corrosion inhibitors of metals and their alloys by measuring the corrosion rate of a test metal sample in a liquid, in the presence of a corrosion inhibitor and without it, in the designs of household washing machines that contain a tank and a wringing drum-drum mounted with the possibility of rotation relative to the vertical axis, included in the internal movable part of the washing machine, a balancing ring with a groove, four supports in the form of rods that are oriented in the vertical space flaxly and pivotally connected to the housing and the inner movable part of the washing machine, and the lower end of the supports is connected to the inner movable part above its center of gravity so that all points of the inner movable part when deviating from the equilibrium position in the vertical plane passing through the supports and its center of gravity move forward, and the upper panel of the washing machine is removed, before assembly, the distances between the edge of the tank and the wall of the housing are measured and aligned in all four directions by installing under the supports I compensate washers, and the inner movable part has such a geometry that its center of gravity is above the bottom of the drum, and on a wire stretched through two holes made in the wall of the drum, at a height corresponding to the position of the center of gravity of the inner movable part, weights of various weights are suspended, and inside the annular groove of the balancing ring installed in the drum at the height of the center of gravity of the inner movable part, the test samples are placed in the form of metal balls of the same size, the inner cavity of the balance the roving ring is filled with a liquid-solution and, hanging additional loads to the drum wall, determine the critical unbalanced mass of the mechanical system, in the presence of which the drum touches the housing wall in the given dimensions of the working area of the inner movable part during acceleration, and in all cases the drum starts and measures periodically during the corrosion process, and the relative difference

certain critical values for the design of unbalanced mass from the time t _{i of the} previous measurement to the time t _{i + 1 of the} current one, where m _i is the critical mass measured in time t _i , m ₁ is the critical mass obtained in the first measurement, m _{i + 1} - a critical value of the mass measured at time interval t _{i + 1,} m ₂ - value critical mass, obtained in the last measurement to the balancing ring without metal balls and residues of the corrosion products, i - the number of measurements, according to the proportion tional corrosion rate Beads

, where Δt = t _{i + 1} -t _i ; P is the total weight of the metal balls; S is the total surface area, characterized in that in order to evaluate the effectiveness of the corrosion inhibitors of metals and their alloys from which the balls are made, a corrosion inhibitor is introduced into the internal cavity of the balancing ring to reduce the corrosion rate of the metal, and to improve mixing of the corrosion inhibitor and enhance the turbulence of the fluid flow on the inner side surface a larger radius of the balancing ring perform additional radial partitions with notches, also in the trench make holes to remove corrosion products, and, at different times, install two balancing rings, one ring is filled with liquid and balls with a corrosion inhibitor, the other ring is filled with liquid and balls without a corrosion inhibitor with the same substance, composition, proportions, and, in both cases, suspended to additional loads, determine the critical unbalanced mass of the mechanical system, in the presence of which the drum touches the wall of the housing during acceleration in the specified dimensions of the working area of the inner movable part, after three revolutions around its vertical axis, and in both cases, when starting the movement of the drum, the determination of Δm is done similarly and in the same sequence as in the case of using a balancing ring with a corrosion inhibitor, and in the case of using a balancing ring without a corrosion inhibitor, and the estimate the effectiveness of the inhibitors is calculated by the formula

where ρ and ρ ₀ are the corrosion rates of the balls in the presence of an inhibitor and without it; γ - inhibitory effect, which shows how many times the inhibitor slows down the corrosion rate.