HOT PRESS FORMED PRODUCT AND METHOD FOR PRODUCTION THEREOF

• Main Authors: YOSHIKAWA YUKIHIRO, OBAYASHI AKIRA, ICHIKAWA MASANOBU, FUKUI KUNIHIRO, TOKI TAMOTSU, IMAI KAZUHITO, SUDO SHUNTARO
• Format: Patent
• Language: English; Korean
• Published: 27.12.2005
• Edition: 7
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

A hot press formed product being improved in corrosion resistance and in the adhesion of a coating film, which is produced by subjecting a zinc-based metal plated steel product to a hot press forming, and has a zinc-based metal plating layer containing and, formed thereon, a zinc oxide layer, wherein the uppermost zinc oxide layer has an average thickness of 2 mum or less; and a hot press formed product being excellent in corrosion resistance, the adhesion of a coating film, the resistance to corrosion after coating, and weldability, which has a basis steel plate (1) and, formed thereon, a layer (2) consisting essentially of an iron-zinc solid solution phase and, as the uppermost layer, a zinc oxide layer (3) having an average thickness of 5 mum or less, and has substantially no iron-zinc intermetallic compound phase, wherein the iron-zinc solid solution layer (2) and the zinc oxide layer (3) contain Al in a total amount of 0.5 g/m2 or less and/or contain Al oxides in a total amount of 5 mg/m2 or less in terms of Al. 내식성과 도장 밀착성이 개선된 열간 프레스 성형품은, 아연계 도금 강재에 열간 프레스 성형을 행하여 철-아연 고용상을 포함하는 아연계 도금층과 그 위에 산화아연층을 구비하고, 최표층의 산화아연층의 평균 두께는 2㎛ 이하이다. 또한, 외관이 양호하고, 내식성, 도장 밀착성, 도장 후 내식성, 및 용접성이 우수한 열간 프레스 성형품은, 베이스 강판(1)의 위에, 본질적으로 철-아연 고용상으로 이루어지는 층(2)을 가지고, 최상층으로서 평균 두께 5㎛ 이하의 산화아연층(3)을 가지고, 실질량의 철-아연 금속간 화합물상을 가지고 있지 않다. 철-아연 고용체층(2)과 산화아연층(3)에 함유되는 Al의 합계량이 0.5g/㎡ 이하 및/또는 Al산화물의 합계량이 Al로서 5㎎/㎡ 이하이다.