STJ(アルミニウム合金/チタン/炭素鋼爆着材)の長期耐候性

概要

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In order to make clear the corrosion resistance of the STJ (structural transition joint) which affects the reliability required for the STJ applied to the ships with long superstructures, the corrosion tests were conducted for the STJ exposed to marine atmosphere or sea water for max. 53 months, and the following results were obtained. (1) While the parts of aluminum alloy were attacked galvanically by the exposure to sea water for 53 months, the bonding strength of the STJ did not reduce, and the tensile strength and shear strength at bonds of the STJ after the exposure were beyond those of requirements described in the specification of STJ proposed by the Japanese Defense Agency. No stress corrosion cracking was found on the all specimens strained plastically by 0.2% and exposed to sea water for 53 months. (2) While the parts of aluminum alloy were slightly attacked galvanically by the exposure to marine atmosphere for 53 months, the reduction of bonding strength and stress corrosion cracking were not found in any specimens exposed to marine atmosphere. When the STJ is applied to the ships with long superstructures, the STJ is usually coated with paints. It is demonstrate that the bonding strength of the STJ has not been deteriorated even where the paints covered on the STJ are damaged extensively, and the STJ is able to be applied to the ships without any anxiety.
社団法人日本船舶海洋工学会の論文
1991-09-04