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A pre-treatment process suitable for high-aluminum mixed body in vehicle plants
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A high-aluminum body technology, applied in the field of pre-treatment process of high-aluminum mixed body, to avoid over-corrosion, easy to filter and remove, dense and complete film heavy effect
Active Publication Date: 2021-09-28
SHENYANG PARKERIZING
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[0009] Aiming at the problems caused by the increase in the proportion of aluminum materials in the traditional process, the present invention provides a pretreatment process suitable for high-aluminum mixed car bodies (the proportion of aluminum plates is between 30% and 80%)
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Embodiment 1
[0046] Embodiment 1 A kind of pre-treatment process suitable for high-aluminum hybrid body of the whole vehicle factory
[0047] In this example, the aluminum plate of the high-aluminum hybrid body of the whole vehicle factory is used as a model to carry out the pretreatment process experiment
[0048] (1) The pretreatment process includes the following steps:
[0049] 1) Wash in hot water
[0050] Spray the aluminum plate with hot water at 42-48°C for 90-100 seconds.
[0051] 2) Pre-skimming
[0052] The aluminum plate washed with hot water is sprayed with a degreasing agent at 42-48°C for 60-70 seconds;
[0085] Embodiment 2 A kind of pre-treatment process suitable for high-aluminum hybrid body of the whole vehicle factory
[0086] In this embodiment, the high-aluminum mixed body of the complete vehicle factory is composed of galvanized sheet, cold-rolled sheet and aluminum sheet, wherein the proportion of aluminum sheet (area percentage of aluminum sheet) is 40%.
[0087] (1) The pretreatment process includes the following steps:
[0088] 1) Wash in hot water
[0089] Spray the high-aluminum mixed body with hot water at 42-48°C for 90-100 seconds.
[0090] 2) Pre-skimming
[0091] Spray and pretreat the high-aluminum composite body after hot water washing with a degreasing agent at 42-48°C for 60-70 seconds;
[0093] The pre-degreased high-aluminum mixed body is degreased in sequence by spraying before entering the tank, dipping in the tank and spraying after leaving the tank. That is, spray with a degreasing agent at 42-48°C for 10-15s be...
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Abstract
The invention discloses a pretreatment process suitable for a high-aluminum mixed vehicle body of a vehicle factory. The process includes the following steps: hot water washing, pre-degreasing, degreasing treatment, water washing, surface conditioning treatment, phosphating treatment, first pure water washing, second pure water washing, passivation treatment and third Pure water wash. The automobile body panels treated by the above process will form a uniform and dense phosphating hybridpassivation film on the surface. Compared with the traditional phosphating treatment, the film on the surface of the aluminum substrate will be more uniform and dense, and due to the The aluminum ion removal agent contained in the product can effectively control the concentration of aluminum ions in the bath, so it can be adapted to occasions where the proportion of aluminum in the car body is high.
Description
technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a pretreatment process of a high-aluminum mixed vehicle body (galvanized plate, cold-rolled plate, aluminum plate). Background technique [0002] With the continuous development of the automobile industry, the lightweight of body materials has formed an industry consensus, and the China Association of Automobile Manufacturers has also formulated a development policy for the lightweight of automobile bodies in the future. [0003] Traditional automobile body materials use a large number of cold-rolled sheets, hot-rolled sheets and galvanized sheets, and aluminum sheets have almost no or a small proportion (less than 5%). The ratio will gradually increase (30% to 80%), and even some high-end cars use all-aluminum body design. Correspondingly, in the pre-treatment process of body painting, corresponding adjustments must be made to the supporting agents t...
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