2results about How to "Avoid intergranular corrosion" patented technology

The utility model discloses a bimetallic wear -resisting composite pipeline, including the butt joint of first pipeline, second pipeline, first pipeline includes first base layer pipeline and sets up first wear -resistant stainless steel layer in first base layer pipeline inside, and second pipeline includes second base layer pipeline and sets up second wear -resistant stainless steel layer outside second base layer pipeline, and the butt joint end between first wear -resistant stainless steel layer and second wear -resistant stainless steel layer forms first weld groove for welding connection, and the butt joint end between first base layer pipeline and second base layer pipeline is provided with the isolating ring, and the butt joint end of isolating ring two ends with first base layer pipeline respectively forms second weld groove for welding, and the butt joint end of isolating ring with second base layer pipeline forms third weld groove for welding. The utility model discloses connecting structure good stability, and the service life of pipeline is long.

The invention provides an aluminum alloy composite plate and a preparation method thereof. The aluminum alloy composite board comprises a core material layer and skin material layers arranged on the two opposite surfaces of the core material layer in a stacked mode. The core material layer comprises the following elements in percentage by mass: 0.2%-0.6% of Si, 0.3%-0.6% of Cu, 0.1%-0.3% of Mg, 0.2%-0.6% of Fe, 1.4%-1.8% of Mn, the sum of the mass content of Ti and the mass content of Zr is 0.15%-0.4%, and the balance is Al; each skin material layer comprises the following elements: 9.5 to 12.0 percent of Si, 0.6 to 1.0 percent of Fe, 1.4 to 1.8 percent of Mg, 0.05 to 0.25 percent of Zn, 0.08 to 0.2 percent of Bi and the balance of Al; the aluminum alloy composite board has good mechanical performance, sagging resistance and corrosion resistance, and therefore the requirement for long-term operation of the offshore wind driven generator is better met.