Abstract: Provided is a method of manufacturing an electric wire with terminal formed by connecting a first core exposed portion of an electric wire to a metal terminal having a box portion that is formed by processing a single conductive board into a box shape and has an opening in which a counterpart terminal is inserted, and a spring inside the box portion. After laser-welding opposed portions where parts of the single conductive board forming the box portion are opposed to each other, applying ultrasonic vibration to a second core exposed portion of the electric wire is executed.

Abstract: A deterioration degree diagnosis device includes a measurement unit and a diagnosis unit. The measurement unit measures an impedance related to a contact resistance of an electrical connection portion by measuring an AC voltage between metal members and an AC current flowing between the metal members in a state where an AC signal of a predetermined frequency is applied to an electric circuit that connects two metal members in contact via the electrical connection portion. The diagnosis unit diagnoses a deterioration degree of the electrical connection portion based on a reactance component value in the impedance measured by the measurement unit.

Abstract: Provided is a method of manufacturing an electric wire with terminal formed by connecting a first core exposed portion of an electric wire to a metal terminal having a box portion that is formed by processing a single conductive board into a box shape and has an opening in which a counterpart terminal is inserted, and a spring inside the box portion. After laser-welding opposed portions where parts of the single conductive board forming the box portion are opposed to each other, applying ultrasonic vibration to a second core exposed portion of the electric wire is executed.

Abstract: A tin-plated product contains: a substrate 10 of copper or a copper alloy; an underlying layer 12 of nickel which is formed on the surface of the substrate 10; and an outermost layer 14 containing tin, the outermost layer 14 being formed on the surface of the underlying layer 12, the outermost layer 14 being composed of a copper-tin alloy layer 14a of a large number of crystal grains of a copper-tin alloy, tin layers 14b of tin having an average thickness of 0.01 to 0.20 micrometers, and a plurality of copper-nickel-tin alloy layers 14c of a copper-nickel-tin alloy, each of the tin layers 14b being formed in a corresponding one of recessed portions between adjacent two of the crystal grains of the copper-tin alloy on the outermost surface of the copper-tin alloy layer, the copper-nickel-tin alloy layers 14c being arranged on the side of the underlying layer 12 in the copper-tin alloy layer 14a so as to be apart from each other.

Abstract: There is provided a tin-plated product having an excellent minute sliding abrasion resistance property when it is used as the material of insertable and extractable connecting terminals, and a method for producing the same. After a nickel layer 16 is formed on a substrate 10 of copper or a copper alloy so as to have a thickness of 0.1 to 1.5 ?m by electroplating, a tin-copper plating layer 12 containing tin 12b mixed with a copper-tin alloy 12a is formed thereon so as to have a thickness of 0.6 to 10 ?m by electroplating using a tin-copper plating bath which contains 5 to 35% by weight of copper with respect to the total amount of tin and copper, and then, a tin layer 14 is formed thereon so as to have a thickness of 1 ?m or less by electroplating if necessary.

Abstract: A deterioration degree diagnosis device includes a measurement unit and a diagnosis unit. The measurement unit measures an impedance related to a contact resistance of an electrical connection portion by measuring an AC voltage between metal members and an AC current flowing between the metal members in a state where an AC signal of a predetermined frequency is applied to an electric circuit that connects two metal members in contact via the electrical connection portion. The diagnosis unit diagnoses a deterioration degree of the electrical connection portion based on a reactance component value in the impedance measured by the measurement unit.

Abstract: There is provided a tin-plated product having an excellent minute sliding abrasion resistance property when it is used as the material of insertable and extractable connecting terminals, and a method for producing the same. After a nickel layer 16 is formed on a substrate 10 of copper or a copper alloy so as to have a thickness of 0.1 to 1.5 ?m by electroplating, a tin-copper plating layer 12 containing tin 12b mixed with a copper-tin alloy 12a is formed thereon so as to have a thickness of 0.6 to 10 ?m by electroplating using a tin-copper plating bath which contains 5 to 35% by weight of copper with respect to the total amount of tin and copper, and then, a tin layer 14 is formed thereon so as to have a thickness of 1 ?m or less by electroplating if necessary.

Abstract: In order to promote the adhesion of a crimp terminal (10) to an aluminum electric wire (100) by virtue of crimping to thereby realize an improvement in electric connecting performance, the thickness of tin plating applied to an inner surface of a conductor crimping portion (13) of the crimp terminal (10) is set to be in the range from 2.1 ?m to 5.0 ?m, and then, the conductor crimping portion (13) is crimped to a conductor (100a) of the aluminum electric wire (100).

Abstract: A tin-plated product formed by electroplating a substrate in a tin plating solution, which contains carbon particles and an aromatic carbonyl compound, to form a coating of a composite material, which contains the carbon particles in a tin layer, on the substrate has a coefficient of friction which is not greater than 0.18, preferably not greater than 0.13, with respect to the same kind of another tin-plated product, and has a glossiness of not less than 0.29 and a contact resistance of not greater than 1.0 m?. The coating has a thickness of 0.5 to 10 micrometers, and the content of carbon in the coating is in the range of from 0.1% by weight to 1.5% by weight. Separate protrusions containing the carbon particles are formed on the surface of the coating. The orientation plane of a tin matrix of the coating is (101) plane.

Abstract: In order to promote the adhesion of a crimp terminal (10) to an aluminum electric wire (100) by virtue of crimping to thereby realize an improvement in electric connecting performance, the thickness of tin plating applied to an inner surface of a conductor crimping portion (13) of the crimp terminal (10) is set to be in the range from 2.1 ?m to 5.0 ?m, and then, the conductor crimping portion (13) is crimped to a conductor (100a) of the aluminum electric wire (100).

Abstract: This method for inhibiting damage due to arc between electrical contacts involves the spreading of a grease composed of from 70% by weight to 95% by weight of a base oil and from 5% by weight to 30% by weight of a thickening agent and additives over a pair of electrical contacts in a circuit which causes terminals to move relative to each other so that they are disconnected from each other, whereby damage on the contact area due to arc occurring when the electrical contacts are isolated from each other is inhibited. As the thickening agent there is preferably used an organic bentonite. As the base oil there is preferably sued an ester oil, glycol oil or poly-?-olefin. The base oil preferably has a low density to reduce arc energy.