Law Of Tensile And Sound Absorption Properties Of Stainless Steel Fiber Porous Materials Before/after Corrosion

Metal fiber porous materials, which is a new structural and functional material with excellent properties developed by advanced industrial countries in the last20years, is widely used in the fields of filtration and separation, damping and buffering suspension, sound absorption and noise reduction, electromagnetic shielding, high efficient combustion and heat transfer enhancement and so on. With the constant enlarging application field and increasing harsh service environment for porous materials, it’s very important to study the properties of corrosion and sound absorption.In this paper,316L stainless steel fiber porous material was used as raw material. The mechanical and corrosion properties of porous materials before/after corrosion were measured through the universal testing machine and double pipe microphone impedance measurement, respectively. The law of the mechanical and corrosion properties was discussed also. In addition, the microstructure of porous materials was observed by SEM. Some results are concluded as follows:1. Tensile strength of stainless steel fiber porous materials after corrosion is lower than the one before corrosion.2. The tensile strength loss rate of stainless steel fiber porous materials increases gradually after corrosion as the fiber diameter decreasing or the porosity increasing or the hydrochloric acid concentration increasing. The highest value is about22%.3. When the hydrochloric acid concentration is lwt%, the sound absorption coefficient of stainless steel fiber porous materials before/after corrosion is invariable generally. When the hydrochloric acid concentration is10wt%, the one after corrosion is higher than before corrosion, about0.2(4000-6000Hz).The research works are supported by the National Basic Research Program of China (No.2011CB610302), National Natural Science Foundation of China (No.51074130,51134003), National Science&Technology Support Plan (No.2012BAC02B05) and Science Innovation Project Plan of Shaanxi Province (No.2011KTCQ01-32) and finished in State Key Laboratory of Porous Metal Materials of Northwest Institute for nonferrous metal research.