| 摘要 |
The invention provides an aluminium alloy plate and a manufacturing method thereof. The aluminium alloy plate is capable of inhibiting emission of yellow colour to an utmost extent even being subjected to anodic oxidation treatment using a sulphuric acid bath, and of emitting colours of a light green-white system free of red. An alauminium alloy plate, in terms of mass percentage, contains 2.0-3.0% Mg, 0.15-0.25% Cr, 0.005-0.20% Ti, or 0.005-0.2% Ti and 0.005-0.05% B, and rest being Al and inevitable impurity, wherein Si in the impurity is in a proportion of 0.15% or lower, while Fe therein is 0.4% or lower, and Mn therein is 0.06% or lower; provided that the content of Cr is TCR% and the solid content of Cr is SCR%, PCR is equal to TCR minus SCR which is greater than or equal to 0.065%. A manufacturing method of an aluminium alloy plate comprises the following steps of: performing thermal rolling on a cast block formed by the aforementioned components after performing homogenization treatment thereon, and then performing cold rolling, and middle annealing by controlling a temperature rise/drop rate of 100 DEG or higher, and performing stabilized annealing by controlling the temperature rise/drop rate of 100 DEG or higher after the cold rolling. |
