Based on various zincation solutions,a novel chemical zincation technique was put forward through applying inhibitor,refining agent,activator,accelerating agent,potential-conditioning agent,stabilizer,surfactant,and non-cyanide composite complexing agent,which has appropriate batch formula,simple maintaining and controlling conditions.

The bioleaching efficiency of different heavy metals from 5 kinds of batteries was investigated; The comparison in release efficiency between bioleaching and chemical extraction was carried out; The influence of initial pH on the bioleaching efficiency was studied.

The crevice corrosion of 22Cr duplex stainless steel in oil field was investigated by using chemical immersion and electrochemical methods,and the crevice corrosion test were performed in different temperature according to practical environment of oil field.

There are three ways can be used to do it which are calcination,steaming in high temperature and Chemical immersion.

Based on the properties of the precise profiled titanium wire that the dimension is small,high accuracy and the requirements of its inner and surface!quality are very high,the article aims to study on preparation of metallographic sample,the way of chemical erosion and aspects needed to pay attention to.