Hot-dip plating method
AssigneeNippon Steel Corporation
InventorsTadaaki Miono, Shinichi Kamoshida, Shinichi Koga, Yasunori Hattori
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Abstract
Provided is a hot-dip plating method that achieves good plating wettability between a metal material and a hot-dip plating bath and that makes it possible to reduce the amount of consumed energy as compared to conventional techniques. In a plating step included in the hot-dip plating method, vibration is applied to a hot-dip plating bath such that the ratio of the average sound pressure level (excluding noise) over ranges each lying between sound pressure peaks at harmonic frequencies of a fundamental frequency to the average sound pressure level (excluding noise) over the measured frequency range in an acoustic spectrum is greater than 0.2.
Claims6
A hot-dip plating method comprising a plating step,
- the plating step comprising causing a metal material to advance into a plating bath which is a molten metal and allowing the metal material to be coated with the molten metal while applying vibration to the plating bath while the metal material is in contact with the molten metal, wherein
- a frequency of the vibration applied to the plating bath is a fundamental frequency,
- in the plating step, the vibration is applied, on the basis of a result obtained by measuring an acoustic spectrum in the plating bath with use of an acoustic measuring instrument dipped in the plating bath, such that the acoustic spectrum measured in the plating bath satisfies a relationship represented by the following expression (1):
- (IB−NB)/(IA−NA)>0.2,
- where
- IA is an average sound pressure level over an entire measured frequency range,
- IB is an average sound pressure level over specific frequency ranges including (i) a range lying between a sound pressure peak at the fundamental frequency and a sound pressure peak at a second-harmonic frequency and (ii) each range lying between sound pressure peaks at adjacent ones of a plurality of harmonic frequencies,
- NA is an average sound pressure level over the entire measured frequency range when the vibration is not applied, and
- NB is an average sound pressure level over the specific frequency ranges defined for the IB when the vibration is not applied, and
- a power of the vibration is not less than 0.5 W and not more than 30 W.
A hot-dip plating method comprising a plating step,
- the plating step comprising causing a metal material to advance into a plating bath which is a molten metal and allowing the metal material to be coated with the molten metal while applying vibration to the plating bath while the metal material is in contact with the molten metal, wherein
- a frequency of the vibration applied to the plating bath is a fundamental frequency,
- in the plating step, the vibration is applied, on the basis of a result obtained by measuring an acoustic spectrum in the plating bath with use of an acoustic measuring instrument dipped in the plating bath, such that the acoustic spectrum measured in the plating bath satisfies a relationship represented by the following expression (1):
- (IB−NB)/(IA−NA)>0.2,
- where
- IA is an average sound pressure level over an entire measured frequency range,
- IB is an average sound pressure level over specific frequency ranges including (i) a range lying between a sound pressure peak at the fundamental frequency and a sound pressure peak at a second-harmonic frequency and (ii) each range lying between sound pressure peaks at adjacent ones of a plurality of harmonic frequencies,
- NA is an average sound pressure level over the entire measured frequency range when the vibration is not applied, and
- NB is an average sound pressure level over the specific frequency ranges defined for the IB when the vibration is not applied, and
- the entire measured frequency range is 10 kHz to 90 kHz.
Dependencies are inferred from the claim text.