Abstract
The paper presents the experimental results of various Cu pipes joint corrosion behavior. Joining of copper pipes used for liquid media transport can be made as demountable and fixed joints. The object is to study corrosion resistance of the joints created by soft soldering, hard soldering and fitting. Corrosion properties were investigated by long-term experiment in two identical experimental devices in stagnant and flowing conditions. The experimental environment was water solution of the 3% NaCl, temperature was kept 20° C for 16 hours and 8 hours 80° C per day. In one of the devices for 8 hours the experimental solution was flowing by the input speed 0.27m.s -1. In the second one no flow was applied. Evaluation of the joints corrosion attacks was performed visually, by light and scanning electron microscopy.
Highlights
Copper pipes are mostly used for the distribution of gas and liquid media in a variety of industries
At present mainly three types of joints are used to connect copper pipes. They are the permanent joints made by soft or hard soldering and the demountable joints formed by pressing plastic ring which creates a joint between the copper pipes fixed closed connection [7 and 8]
Higher temperature (80°C) does not influence the character of corrosion products but their formation is shifted to more acid area
Summary
Copper pipes are mostly used for the distribution of gas and liquid media in a variety of industries. They are used for their excellent corrosion properties and long life [1 - 6]. Due to the differences in device geometry of distribution lines, copper pipes must be bent in certain locations or linked with another circuit. At present mainly three types of joints are used to connect copper pipes. The joints in copper pipes comprise inhomogeneities which affect, e.g. media flow change, character and sedimentation of corrosion products and the degradation process. The main aim of the work was to monitor the synergetic effect of mechanical and chemical stress on corrosion-erosion behavior of the copper pipes joints. The degradation was assessed visually, by light and scanning electron microscopy
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