Automated data and search system “Korroziya”

Abstract

The DSS ~Korroziya ~ is based on a personal computer type IBM PC XT/AT with an internal memory of at least 640 kbyte, having a hard disk of at least 10 Mbyte. The software for the DSS ~Korroziya* was worked out with the aid of the system for the control of databases "Klipper. ~ The information stored in the DSS ~Korroziya" has a hierarchic structure. At the uppermost level of the hierarchy is information on the literature source. At the subsequent levels are data on production and processes (technological stages, devices). Each literature source may contain data for several kinds of production, and the latter, in turn, may contain data for several processes. Each process (stage, device) is characterized by parameters such as composition of the reaction medium, pH, temperature, pressure. For a certain process the characteristics of the tested metallic and nonmetallic materials are given: the brand of the material, the state of the metal (solid, welded, heat-treated, etc.); the following information is also given: industrial or model tests, duration of the tests (in hours), nature and rate of corrosion, changes of the physicomechanical properties of the metal, nature of the corrosion products, changes of the reaction medium after the tests, methods of enhancing the corrosion resistance of materials. For nonmetallic materiaIs data on the change of weight, the state of the surface of the material, changes of mechanical indices, and an estimate of the durability were introduced. The data on the reaction medium are complemented by indices of aggressiveness of the medium (components determining the corrosion of materials, activating and passivating components), by information on mixing, phase state (liquid, gas). The most important data on the reaction medium and materials are coded (names of chemical substances, brands of materials, nature of the corrosion, etc.). The DSS ~ Korroziya" uses various alternatives of the basic function of data search according to the user's requirements. For the simplest single-factor search one search element is specified (a fragment of the name of the literature source and production, the code of the substance or material). Multifactor search envisages the specification of all the data for the object of the search. From all the data the block "Handbook of Chemical Substances* receives data for media with few components in which corrosion of materials is determined by the basic substance (nitric, sulfuric, hydrochloric, adipic, citric, acetic acids, ammonia water, chloride coomining media, methanol). Upon inquiry concerning the mentioned chemical substances, the DSS "Korroziyan issues the corrosion characteristics stored in this block. The DSS "Korroziya* provides operatively both reference data and data on the corrosion of strucutral materials in actual technological media devices: