MANUFACTURING METHOD FOR ALUMINUM-RESIN COMPOSITE

To provide a manufacturing method for an aluminum-resin composite in which higher joining strength can be obtained.SOLUTION: A manufacturing method includes: a first roughening process in which an alkaline surface roughening agent containing NaOH as a hydroxide ion of 5.0 wt.% or more and 9.3 wt.% or less, Zn ions of 1.9 wt.% or more and 3.5 wt.% or less, nitric acid ions, and thiosulfate ions is brought into contact with a surface of an aluminum alloy containing Si of 0.5 wt.% or more and 16 wt.% or less, and Cu of 0.5 wt.% or more and 5.5 wt.% or less; a second roughening process in which an acidic surface roughening agent containing hydrochloric acid of 2.4 wt.% or more and 4.2 wt.% or less in terms of acid concentration, and aluminum chloride of 4.1 wt.% or more and 5.8 wt.% or less in terms of aluminum concentration is brought into contact with the surface of the aluminum alloy obtained in the first roughening process; a cleaning process to ultrasonically clean the surface of the aluminum alloy obtained in the second roughening process; and a joining process to join a resin composition to the surface of the aluminum alloy obtained in the cleaning process.SELECTED DRAWING: None 【課題】より高い接合強度が得られるアルミニウム－樹脂複合体の製造方法の提供を目的とする。【解決手段】Ｓｉを０．５重量％以上１６重量％以下及びＣｕを０．５重量％以上５．５重量％以下含有するアルミニウム合金の表面に、ＮａＯＨを水酸化物イオンとして５．０重量％以上９．３重量％以下と、Ｚｎイオンを１．９重量％以上３．５重量％以下と、硝酸イオンと、チオ硫酸イオンとを含むアルカリ性の表面粗化剤を接触させる第１粗化工程と、前記第１粗化工程を経たアルミニウム合金の表面に、酸濃度として２．４重量％以上４．２重量％以下の塩酸と、アルミニウム濃度として４．１重量％以上５．８重量％以下の塩化アルミニウムとを含む酸性の表面粗化剤を接触させる第２粗化工程と、前記第２粗化工程を経たアルミニウム合金の表面を超音波洗浄する洗浄工程と、前記洗浄工程を経たアルミニウム合金の表面に樹脂組成物を接合させる接合工程とを含む。【選択図】なし