Abstract
Internal stress of electro-deposit was measured by electric resistance wire type strain-meter for the purpose of obtaining the deposit of low internal stress in nickel electroforming.
Though this method had some points to be improved, was practically satisfactory to get absolute value as expected in nickel electroforming.
(1) Extension stress is found in the deposit in nickel sulfamate bath, and the deposit of low internal stress is obtained under the condition for high hardness deposit.
(2) Primary brightner generally reduces the internal stress of the deposit, but increases by adding sodium benzil napthalen sulfonate to the bath.
(3) It is possible to reduce the internal stress to zero in nickel sulfamate bath including nickel chloride.
(4) Some reagents of secondary brightner decrease the internal stress of deposit in proportion to the increase of other additional reagents.
