Pre-oxidation erosion of aluminum alloy parts

erosion is the first process before aluminum and aluminum alloy parts are oxidized, and it is also one of the key steps to ensure the quality of the oxide filmin order to ensure the quality of immersion, before the immersion needs to go through a series of pre-treatment, in addition to the need to remove the surface of the piece can not be with the alkaline solution chemical reaction, or although a chemical reaction can be carried out, but will seriously affect the quality of the surface of the piece of all impurities, but also according to the degree of adhesive oil on the surface of the piece organic solvent cleaning or in a weak alkaline solution containing surfactants pre-treatment, in order to remove thick oil and other dirterosion is not only the process of completely removing oil pollution, but also the process of removing the oxide filmTherefore, before and after the immersion of the various processes need to work closely together, to take a single organic solvent cleaning or in a weak alkaline solution cleaning is not able to meet the requirements of the finished surface oil pollution processIf the main part of the production directly for strong alkali immersion treatment, it will be due to the surface uneven oil pollution barrier, immersion solution can not be synchronized in the aluminum parts surface chemical reaction, so the surface will be destroyed, reaction, serious will also appear pothole inequality, will seriously affect the appearance of the product, but also bring with toleranceand and other quality ills, light repair, heavy scrapHowever, before the strong alkali immersion is not all need to go through these processes, but also depends on the surface condition of the components: the surface is good, no serious oil contamination of the components can be directly immersed in the strong alkaliafter immersion, light (also known as neutral) treatment is required to remove hanging ash and hard-to-wash alkaline substances left during immersionIn order to achieve a clean surface, so that the surface of the assembly completely exposed, to ensure that the solution of the next process is free from contamination, and to obtain a normal oxide film to lay the foundationThe steps to be taken in the whole process ofimmersion treatment are:(1) removal of the surface adhesive of the production,(2) organic solvent cleaning,(3) chemical cleaning,(4) alkali erosion,(5) lightthe technical requirements, operating points and precautions in the above-mentioned process are discussed systematically in the answers to the questions in the following sections