Mazda Motor Corporation

Teruaki Asada

Tsutomu Shigenaga

Katsunobu Sasaki

Akihide Takami

Akihiro Kobayashi

Masatoshi Shinomori

Tatsuya Ezaki

Yuji Nakanishi

Raiki Kabuchi

A corrosion-resistance testing method for a coated metal member formed of a metallic substrate provided with a surface treatment coating includes an electrification step for applying a voltage and/or a current between a surface of the surface treatment coating and the metallic substrate in a state where a corrosion factor is in contact with the surface of the surface treatment coating so as to measure a temporal change in a current and/or a voltage occurring between the surface of the surface treatment coating and the metallic substrate, and an evaluation step for evaluating a defect occurrence status of the surface treatment coating based on a waveform of the temporal change.

Corrosion-resistance testing method for coated metal member, corrosion-resistance testing apparatus for coated metal member, corrosion-resistance testing program for coated metal member, and storage medium

A damaged portion treatment method is for treating one or more damaged portions formed in a coated metal material that includes a metal base and a surface treatment film provided on the metal base, the one or more damaged portions reaching the metal base through the surface treatment film. The damaged portion treatment method includes the steps of: disposing a water-containing material to be in contact with one or two out of the damaged portions and one or two electrodes to be in contact with the water-containing material, and electrically connecting, with an external circuit, between the electrode and the metal base, or between the two electrodes; and supplying a current between the electrode and the metal base, or between the two electrodes while alternately switching a direction of the current flowing through the external circuit, with the external circuit.

Damaged portion treatment method and damaged portion treatment device, and corrosion resistance test method and corrosion resistance test apparatus for coated metal material

Provided is a measurement method for measuring a size of a damaged portion in a coated metal material that includes a metal base and surface treatment film provided on the metal base, and reaching the metal base through the surface treatment film. The measurement method includes the steps of disposing a water-containing material to be in contact with the damaged portion and an electrode to be in contact with the water-containing material, and electrically connecting between the electrode and the metal base with an external circuit; applying, with the external circuit, a constant voltage between the electrode and the metal base, as a cathode and an anode, respectively, and measuring a current value flowing therebetween; and calculating a size of the damaged portion, based on the current value measured and a correlation between the current value and the size of the damaged portion, determined on an exploratory basis in advance.

Measurement method and measurement device, and corrosion resistance test method and corrosion resistance test apparatus for coated metal material

A physical property evaluation method is the method for evaluating physical properties of a film-shaped measurement target object by means of an electrochemical method, the method including the step of causing an electrolytic solution to contact a front surface of the measurement target object. The speed of penetration of the electrolytic solution into the measurement target object is adjusted in such a manner that the levels of the front-side temperature and the back-side temperature of the measurement target object and a difference between the front-side temperature and the back-side temperature of the measurement target object are adjusted.

Physical property evaluation method and device

A corrosion resistance test method for a coated metal material that includes a metal base and a surface treatment film, includes the steps of: disposing one or more water-containing material holders each holding a water-containing material to be in contact with the surface treatment film and one or more electrodes to be in contact with the water-containing material, and electrically connecting, with an external circuit, between the one electrode and the metal base, or between the electrodes; and supplying a current between the one electrode and the metal base, or between at least one of the electrodes and at least one of the other electrodes, as an anode and a cathode, to bring corrosion of the coated metal material to progress. The water-containing material comprises water, an electrolyte material, and kaolinite, and comprises the kaolinite at 36.0 mass % or more to 45.0 mass % or less.

Corrosion resistance test method for coated metal material and water-containing material for use therein

An anticorrosion test method for a coated metallic material may include: a preparation step of adding an artificial flaw at two positions of the coated metallic material; a first measurement step of measuring a size of the artificial flaw; a connection step of electrically connecting the artificial flaws at the two positions by an external circuit via water-containing materials; an energization step of energizing a steel sheet to produce a bulge of an electrodeposition coating film; a second measurement step of measuring size of the bulge of the electrodeposition coating film; a calculation step of calculating a degree of progress of corrosion of the coated metallic material; and a correction step of correcting the degree of the progress of the corrosion.

Anticorrosion test method and anticorrosion test equipment for coated metallic material

A corrosion resistance test method for a coated metal material that includes a metal base and a surface treatment film, includes the steps of: disposing one or more water-containing material holders each holding a water-containing material to be in contact with the surface treatment film and one or more electrodes to be in contact with the water-containing material, and electrically connecting, with an external circuit, between the one electrode and the metal base, or between the electrodes; and supplying a current between the one electrode and the metal base, or between at least one of the electrodes and at least one of the other electrodes, as an anode and a cathode, to bring corrosion of the coated metal material to progress. The water-containing material has a viscosity at 65&#xb0; C. of 10 mPa&#xb7;s or more to 40 mPa&#xb7;s or less.

Provided is a measurement method for measuring a size of expansion of a surface treatment film occurred in a coated metal material that includes a metal base and the surface treatment film provided on the metal base. The measurement method includes the steps of disposing a water-containing material to be in contact with the expansion and an electrode to be in contact with the water-containing material, and electrically connecting between the electrode and the metal base with an external circuit; applying, with the external circuit, a constant voltage between the electrode and the metal base, as a cathode and an anode, respectively, and measuring a current value flowing therebetween; and calculating a size of the expansion, based on the current value measured and a correlation between the current value and the size of the expansion, the correlation being determined on an exploratory basis in advance.

A corrosion resistance tester for a coated metal material including a surface treatment film on a metal substrate includes: a container placed on the surface treatment film, and having a bottom surface in contact with the surface treatment film, the container including a plurality of water-containing electrolyte material holders that open through the bottom surface; the water-containing electrolyte material contained in each of the water-containing electrolyte material holders of the container, and being in contact with an associated one of a plurality of separate measurement target portions of the surface treatment film; a plurality of electrodes being each in contact with the water-containing electrolyte material contained in an associated one of the water-containing electrolyte material holders; an external circuit connecting the electrodes together; and a conduction means configured to conduct electricity to the metal substrate through the electrodes and the external circuit.

Corrosion resistance tester for coated metal material

The method for a corrosion resistance test of a coated metal material is an electrochemical method simulating corrosion proceeded by damaged portions in the surface treatment film. Two artificially damaged portionsspaced from each other in a coated metal materialthat is obtained by providing a surface treatment filmon a metal baseare electrically connected to each other by an external circuitvia an aqueous electrolyte material, and corrosion proceeds by supplying current using one of the artificially damaged portionsas an anode site and the other as a cathode site.

Corrosion resistance test method and corrosion resistance test apparatus for coated metal material

Disclosed herein is a method of testing a corrosion resistance of a coated metal material including a surface treatment film on a metal substrate. The method includes: treatment of interposing a water-containing electrolyte material containing water, a supporting electrolyte, and a water penetration enhancer, between a surface of the surface treatment film of the coated metal material and an electrode; holding of the water-containing electrolyte material on the surface of the surface treatment film for one minute to one day; and electrical conduction from the electrode through the water-containing electrolyte material to the coated metal material.

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Hiroshima, Japan

Teruaki Asada