Formula and process of crystal ceramic fluid for high-silicon aluminum alloy piston surface treatment of engine

Abstract

The invention discloses piston surface treatment of a high-power engine and particularly discloses a crystal porcelain liquid formula and process for treatment of a surface layer of a high-silicon aluminum alloy piston of an engine. The process comprises the following steps: 1) cleaning a piston workpiece by using a metal cleaning agent; 2) adding well prepared crystal porcelain liquid into a treatment liquid tank, applying a positive electrode to the crystal porcelain liquid and applying a negative electrode to the piston workpiece; 3) mounting a circulating cooling water pipe outside the treatment liquid tank for controlling the temperature of the crystal porcelain liquid, wherein the temperature of the crystal porcelain liquid is below 60 DEG C; 4) keeping the conditions as follows: the voltage of a power supply is 120V, the current is 150A, the alternating frequency is 500Hz and the crystal porcelain time is 50min; 5) taking out the piston workpiece, drying and polishing a combustion chamber of the piston workpiece and a piston ring groove. The crystal porcelain liquid formula and process for treatment of the surface layer of the high-silicon aluminum alloy piston of the engine can directly perform crystal porcelain treatment on the combustion chamber of the high-silicon aluminum alloy piston and the piston ring groove once after processing so as to increase the hardness and the resistance to hot corrosion.

Description

Technical field [0001] The invention relates to a surface treatment of a piston of a high-power engine, in particular to a formula and a process for treating the surface layer of a high-silicon aluminum alloy piston of an engine. Background technique [0002] High-power engine pistons are made of high-silicon aluminum alloy, with a silicon content of more than 13%. Thermal shock deformation is small, the coefficient of thermal expansion is small, the piston head is processed with an arc-shaped combustion chamber, the combustion chamber instantly withstands high temperature impact and thermal corrosion of 1200 degrees, and the surface of the combustion chamber is sprayed with graphite, ceramics and other processes. When there is thermal shock, graphite Or the ceramic layer cracks, falls off, peels off, pulls the cylinder, etc. The high temperature and corrosive substances generated by the fuel during the compression work in the cylinder liner will cause the piston combustion chamb...

AI Technical Summary

Problems solved by technology

The thermal shock deformation is small, the thermal expansion coefficient is small, the piston head is processed with an arcuate combustion chamber, and the combustion chamber withstands 1200 degrees of high-temperature impact and thermal corrosion instantly. Now, the surface of the combustion chamber is sprayed with graphite, ceramics and other processes. When there is thermal shock, the graphite Or the ceramic layer produces cracks, blocks, peeling, cylinder scuffing, etc., and the high temperature and corrosive substances generated by the fuel when it is compressed in the cylinder liner will cause the piston combustion chamber to be ablated (referred to as "burning cylinder head") to make the engine Reduced combustion efficiency and reduced piston life

[0003] The piston has two annular grooves for installing the piston ring. When the piston is die-casting the blank, a ceramic skeleton needs to be embedded in the piston ring groove to make the piston ring groove have high wear resistance, resulting in low die-casting efficiency. Installation Increased cost of ceramic skeleton

[0004] Low-temperature hard anodization and conventional anodization of high-silicon aluminum alloys are very difficult, the cost is high, and the performance cannot meet product requirements

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