PROBLEM TO BE SOLVED: To reliably provide an alloy layer of the predetermined film thickness not only on a horizontal surface but also on a curved surface, to consistently provide the alloy layer consisting of various kinds of metals without any pin hole, and to rapidly and efficiently provide the alloy layer of various kinds of metals on surface of various kinds of base metals by drying binder in a short period of time while using the binder for bonding metal powder.SOLUTION: A metal surface treatment method includes: a temporary filming process in which a thin film 7 is arranged on a surface of a base metal 1, and a metal powder layer 3 is provided between the thin film 7 and the base metal 1 by bonding metal powder 2 different from the base metal 1 with binder 6 a drying process in which the binder 6 is dried by applying energy beam 4 to a surface of the thin film 7 after the temporary filming process without melting the thin film 7 and a beam applying process in which the thin film 7 is melted by further applying the energy beam 4 to the surface of the thin film 7 after drying the binder 6 in the drying process, or the metal powder 2 is melted without melting the thin film, and an alloy layer 5 is provided on the surface of the base metal 1.COPYRIGHT: (C)2013,JPO&INPIT【課題】所定の膜厚の合金層を、水平な平面のみでなく湾曲面にも確実に設ける。種々の金属からなる合金層をピンホールなく安定して設ける。金属粉末の付着にバインダを使用しながら、短時間に乾燥して、種々の母材金属の表面に種々の金属の合金層を速やかに能率よく設ける。【解決手段】金属の表面処理方法は、母材金属1の表面に薄膜7を配置し、かつ、この薄膜7と母材金属1との間に、母材金属1と異なる金属粉末2をバインダ6で付着して金属粉末層3を設ける仮膜工程と、この仮膜工程の後、薄膜7の表面に、薄膜7を溶融することなくエネルギービーム4を照射してバインダ6を乾燥させる乾燥工程と、この乾燥工程でバインダ6を乾燥させた後、さらに、薄膜7の表面にエネルギービーム4を照射して、薄膜7を溶融し、あるいは溶融することなく、金属粉末2を溶融して母材金属1の表面に合金層5を設けるビーム照射工程とからなる。【選択図】図4
