COATED METAL STOCK CORROSION RESISTANCE TESTING METHOD AND HYDROUS MATERIAL USED THEREFOR

• Main Authors: SASAKI MASANORI, ASADA TERUAKI, EZAKI TATSUYA, SHIGENAGA TSUTOMU, TAKAMI AKIHIDE
• Format: Patent
• Language: English; Japanese
• Published: 08.04.2022
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

To provide a coated metal stock corrosion resistance testing method with which highly reliable evaluation results are obtained in a shorter time, and a hydrous material in this method.SOLUTION: Provided is a method for testing the corrosion resistance of a coated metal stock 1 created by coating a sheet plate 2 with an electro-deposition coating film 4. The method comprises: a step for arranging two hydrous material holding units 11 for holding a hydrous material 6 being in contact with the electro-deposition coating film 4 and two electrodes 12 being in contact with the hydrous material 6 that is accommodated in each of two hydrous material holding units 11, as well as electrically connecting between the two electrodes 12 by an external circuit 7; and a step for establishing electrical continuity between one and the other of two electrodes 12 as an anode and a cathode, respectively, by electrical continuity means 8 provided in the external circuit 7, and thereby causing the corrosion of the coated metal stock 1 to proceed. The hydrous material 6 contains water, electrolyte material and kaolinite, the content of kaolinite in the hydrous material 6 being 36.0% by mass to 45.0% by mass, both ends inclusive.SELECTED DRAWING: Figure 3 【課題】より短時間で信頼性の高い評価結果が得られる被覆金属材の耐食性試験方法及び該方法に用いられる含水材料を提供する。【解決手段】鋼板２に電着塗膜４が設けられてなる被覆金属材１の耐食性試験方法であって、電着塗膜４に接触する含水材料６を保持する２つの含水材料保持部１１と、２つの含水材料保持部１１の各々に収容された含水材料６に接触する２つの電極１２と、を配置するとともに、２つの電極１２間を外部回路７により電気的に接続するステップと、外部回路７上に設けられた通電手段８により、２つの電極１２の一方及び他方を、それぞれアノード及びカソードとして両者間に通電することにより、被覆金属材１の腐食を進行させるステップと、を備え、含水材料６は、水、電解質材料及びカオリナイトを含み、含水材料６中におけるカオリナイトの含有量は、３６．０質量％以上４５．０質量％以下である。【選択図】図３