Study of tin-cerium alloy electroplating using ultrasonic;

Influences of oxidation of ceric additive on acidic tin-cerium alloy electroplating were discussed.

Analysis of surface defect on H68 copper alloy strip

Electroplated Cu-Sn alloy coating is good in decoration and solderability,low in cost,non-toxic,not irritable,etc.

The method use SCR continuous casting-rolling system to make conducting wire(Cu-Sn alloy rod) for railway application was introduced.

The paper describes the process ofφ20mm Cu-Sn alloy wirebar production in continuous casting and roiling process,analyzes the impact of the wirebar s oxygen and tin content distribution on production stability, describes the cold-forming process of contact wire manufacturing by drawing machine,and studies and compares anti-drawing strength and extension capability of it.

A method to directly determine the tin in the plating bath for a novel acidic bright tin-copper alloy coating was established based on releasing back titration, which was aiming at eliminating the reference of Cu 2+ and preventing the Sn 2+ and Sn 4+ from hydrolysis.

Minim copper in new acidic bright tin-copper alloy plating bath was determined by spectrophotometrie method using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol(5-Br-PADAP)as chromogenic reagent,and measuring wavelength was optimized.

By sintering the tin-copper films electroplated from an alkaline solution under different temperatures, several kinds of the tin-copper alloy negative electrodes were prepared.