2results about How to "Corrosion" patented technology

The present invention relates to the technical field of pressure sensors, and discloses an EGR differential pressure sensor, wherein the detection unit comprises a detection core and a drainage pipe, wherein the detection core comprises a sintered seat with a pressure detection element disposed therein and a metal pressure diaphragm disposed at both ends of the sintered seat; the drainage pipe is connected to both ends of the detection core and communicated with a pressure test pipe port, and is used to drain the measured gas from the pressure test pipe port to the detection core, so that particulate pollutants such as carbon deposits are kept away from the detection core. The EGR differential pressure sensor, by adding a drainage pipe with a guiding and drainage function to the detection core, separates the measured gas from the pressure detection element of the sensor, and only contacts the metal pressure diaphragm of the detection core. The guidance of the drainage pipe has a buffering effect on the measured gas with a large impact force, and at the same time, the carbon deposit particles are attached to the inner wall of the drainage pipe, so that the carbon deposits are separated from the detection core to avoid corrosion.

This invention relates to the field of composite coating technology, specifically to a composite coating for an aluminum-silicon wire submerged roll, its preparation method, and its application. The method involves sequentially depositing CoCrW, CoCrW-Ca2SiO4, Ca2SiO4, and Si-SiC, or sequentially depositing Ca2SiO4 and Si-SiC, on the surface of the submerged roll using atmospheric plasma spraying (APS). Subsequent machining then yields a four-layer CoCrW / CoCrW-Ca2SiO4 / Ca2SiO4 / Si-SiC composite coating or a two-layer Ca2SiO4 / Si-SiC composite coating (hereinafter referred to as the composite coating) with a specified surface roughness. The composite coating prepared by the method described in this invention can withstand temperatures up to 900℃ and possesses excellent wear resistance and aluminum-silicon corrosion resistance, significantly improving the lifespan of the submerged roll.