公开(公告)号：US20020114971A1

公开(公告)日：2002-08-22

申请号：US09992962

申请日：2001-11-06

Applicant: Nisshin Steel Co., Ltd.

Inventor： Masaya Yamamoto ,  Mitsuo Asabuki ,  Shigeyasu Morikawa ,  Shinya Furukawa ,  Hirofumi Taketsu

IPC: B32B015/04 ,  B32B015/18

CPC classification number: C23C22/44 ,  C23C22/364 ,  C23C22/368 ,  Y10T428/12611 ,  Y10T428/12618 ,  Y10T428/12743 ,  Y10T428/12757 ,  Y10T428/12951

Abstract: A chemically processed steel sheet comprises a steel base coated with an Al-Si alloy plating layer, whose Si content is preferably adjusted to 5-13 mass % as a whole and to 7-80 mass % at a surface, and a converted layer generated on the surface of the plating layer. The converted layer contains both of soluble and scarcely-soluble compounds. The soluble compound such as a manganese oxide or hydroxide or a valve metal fluoride is once dissolved to water in an atmosphere and then re-precipitated as scarcely-soluble compounds at defective parts of the converted layer. The scarcely-soluble compounds act as a barrier for corrosion-prevention of a base steel. Due to the re-precipitation, i.e. self-repairing faculty, excellent corrosion resistance of the converted layer is still maintained even after defects are introduced therein during plastic deformation of the steel sheet.

Abstract translation: 化学处理钢板包括涂覆有Al-Si合金镀层的钢基体，其Si含量作为整体优选调整为5-13质量％，并且在表面上具有7-80质量％，并且产生转化层 在镀层的表面上。 转化层含有可溶性和几乎不溶的化合物。 可溶性化合物如氧化锰或氢氧化物或阀门金属氟化物一旦在大气中溶解到水中，然后在转化层的缺陷部分再沉淀成几乎不溶的化合物。 几乎不溶解的化合物作为防止基体钢的屏障。 由于重新沉淀，即自修复人员，即使在钢板的塑性变形期间引入缺陷之后，仍然保持转化层的优异的耐腐蚀性。