The mixed aqueous solution has good wettability, foaming ability and emulsifiability when mass ratio of cationic surfactant and disodium sulfosuccinate monotridecanol polyoxyethylene(3)ether was 1:5 and content of cationic and anionic surfuctants in this solution was 0.

Influence of branching on physical characters such as foam,wetting power and detergency were studied.

With the increase in the polymerization number of oxyalkylene or in the carbon atom number of fatty acid, the critical micelle concentration decreased, the foaming ability reduced, the wetting power of the former reduced and that of the latter tended to enhance.

Sulfosuccinic acid alkyl polyethylene monoester disodium salts were prepared and their sur-face active properties such as critical micelle concentration,wetting power, foaming ability andfoam stability were investigated systematically.

The wetting force can be improved with higher soldering temperature and longer time of preheating and soldering, but it will be decr.

it has higher wetting force and smaller wetting angle.

In this paper,three types of wettability evaluation methods,namely wetted spreading area test,wetting force test and contact angle test,have been used to measure the wettability of Sn-37Pb using different fluxes which include different concentration of the rosin.