CN105986222A - Hot-dip aluminizing process - Google Patents

Abstract

The invention discloses a hot-dip aluminizing process. The hot-dip aluminizing process is characterized by comprising the following steps: 1) oil removal and rust removal; 2) surface assisted plating; 3) hot dipping of aluminum; and 4) diffusion aluminizing. The process provided by the invention is simple, omits a great number of repeated procedures and has improved work efficiency.

Description

A kind of hot dipping alumetizing process

Technical field

The present invention relates to a kind of hot dipping alumetizing process.

Background technology

Hot-dip aluminizing is the process that domestic employing is most, the most with low cost, consumption aluminium is few, leaching aluminium lamination thickness about 0.5～1.0mm, diffusion no longer with aluminum, also has some workpiece not to be diffused aluminising, directly uses after leaching aluminum, so there being people to cry hot-dip aluminizing, such as parts such as highway barrier, door and window, steel plates.The energy of hot aluminizing can be with coal or coke, and productivity ratio is high, can mechanization produce continuously.The shortcoming of hot-dip aluminizing is that technical difficulty is bigger Particularly helping depositing process wayward, quickening liquid wants matching while using. in case quickening liquid lost efficacy. bring and leakage ooze it addition, hot aluminizing crucible is easily corroded by aluminum liquid, the heat-resisting cast iron pot of 10～20mm with 5～7 times it is possible to eating thrown.Do the inner lining for cooker life-span with refractory material can improve. but conductivity of heat is poor, consumes the energy big, and hot-dip aluminizing percent defective is higher, accounts for 20～30%.

Hot-dip aluminizing complex manufacturing at present, unified standard, does not causes hot-dip aluminizing quality uneven, and a lot of operations that repeat also make under production efficiency, increases the work burden of workman, makes the competitiveness of product in market the highest simultaneously.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of hot dipping alumetizing process, and this technique is simple, eliminates a lot of repeatability operation, improves work efficiency.

For achieving the above object, the invention provides a kind of hot dipping alumetizing process, it is characterized in that, comprise the steps, 1) degreasing and rust removal: degreaser is 20%NaOH+5%Na2SO4+10%Na2Co3+ water, heating be preferably to 80～100 DEG C, immersion adds～30min, if surface and oil contaminant is too many, can first slightly wash with gasoline, or burn with water, then water rinses dirt, and 36% technical hydrochloric acid is used in rust cleaning. and soaking steel part 30～60min under room temperature, rust is many can extend soak time, until exposing metal surface, water washes away the acid solution of residual and dries；Also can eliminate rust with 10～20%H2SO4 aqueous solutions, but pickling is not overweight, in case matrix corrosion；

2) surface helps plating: the quickening liquid used, and produces layer protecting film at active surface, during hot dipping; this film quickly dissolves, and exposes again original active metal surface, in order to hot aluminizing; under room temperature, after steel part soaks 3～lOmin. taking-ups wherein, water rinses, and then dries 1h at 80～100 DEG C；

3) hot aluminizing: will meet two grades of aluminium ingots of GB1196 83 standard, is heated to 730～780 DEG C of fusings in being placed on crucible, then the steel part that will handle well immerses in aluminum liquid 5～10s, and steel piece surface i.e. hangs last layer silvery white

Aluminum；

4) Diffusional aluminizing: the purpose of Diffusional aluminizing is to make hot dipping aluminum component, at high temperature. aluminum atom spreads to intrinsic silicon, because austenite is bigger than ferritic diffusion coefficient. so diffusion temperature is selected in more than AC point, carbon steel optional 950～10OO ~ C, it is incubated 4～6h.

The invention has the beneficial effects as follows: present invention process is simple, eliminate a lot of repeatability operation, improve work efficiency.

Detailed description of the invention

Technical scheme disclosed by the invention is a kind of hot dipping alumetizing process, comprises the steps, 1) degreasing and rust removal: degreaser is 20%NaOH+5%Na₂SO₄+ 10%Na₂Co₃+ water, heating be preferably to 80～100 DEG C, immersion adds～30min, if surface and oil contaminant is too many, can first slightly wash with gasoline, or burn with water, then water rinses dirt, and 36% technical hydrochloric acid is used in rust cleaning. and soaking steel part 30～60min under room temperature, rust is many can extend soak time, until exposing metal surface, water washes away the acid solution of residual and dries；Also can be with 10～20%H₂SO₄Aqueous solution eliminates rust, but pickling is not overweight, in case matrix corrosion；

2) surface helps plating: the quickening liquid used, and produces layer protecting film at active surface, during hot dipping; this film quickly dissolves, and exposes again original active metal surface, in order to hot aluminizing; under room temperature, after steel part soaks 3～lOmin. taking-ups wherein, water rinses, and then dries 1h at 80～100 DEG C；Helping plating is the committed step of aluminising part; process bad generation leakage to ooze. directly affect product quality; the purpose helping plating be to maintain rust cleaning after the active metal surface that exposes of steel part; this active face is kept to contact with aluminum liquid during hot dipping; when diffusion; guarantee aluminum atom is directly seeped in matrix; but; active surface the most easily aoxidizes; once produce oxidation, not only can not soak aluminum, and cannot be carried out diffusion; thus produce and leakage ooze so active surface must be protected by before hot aluminizing

3) hot aluminizing: will meet two grades of aluminium ingots of GB1196 83 standard, is heated to 730～780 DEG C of fusings in being placed on crucible, then the steel part that will handle well immerses in aluminum liquid 5～10s, and steel piece surface i.e. hangs last layer silvery white

Aluminum；

4) Diffusional aluminizing: the purpose of Diffusional aluminizing is to make hot dipping aluminum component, at high temperature. aluminum atom spreads to intrinsic silicon, because austenite is bigger than ferritic diffusion coefficient. so diffusion temperature is selected in more than AC point, carbon steel optional 950～10OO ~ C, it is incubated 4～6h.

Present invention process is simple, eliminates a lot of repeatability operation, improves work efficiency.

The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should be in the protection domain being defined in the patent claims the most on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (1)

1. a hot dipping alumetizing process, it is characterised in that comprise the steps, 1) degreasing and rust removal: degreaser is 20%NaOH+5%Na₂SO₄+ 10%Na₂Co₃+ water, heating be preferably to 80～100 DEG C , soak and add～30min, if surface and oil contaminant is too many, can first slightly wash with gasoline, or burn with water, then water rinses dirt, and 36% technical hydrochloric acid is used in rust cleaning. soak steel part 30～60min under room temperature, rust is many can extend soak time, until exposing metal surface, water washes away the acid solution of residual and dries；Also can be with 10～20%H₂SO₄Aqueous solution eliminates rust, but pickling is not overweight, in case matrix corrosion；

2) surface helps plating: the quickening liquid used, and produces layer protecting film at active surface, during hot dipping; this film quickly dissolves, and exposes again original active metal surface, in order to hot aluminizing; under room temperature, after steel part soaks 3～lOmin. taking-ups wherein, water rinses, and then dries 1h at 80～100 DEG C；

3) hot aluminizing: will meet two grades of aluminium ingots of GB1196 83 standard, is heated to 730～780 DEG C of fusings in being placed on crucible, then the steel part that will handle well immerses in aluminum liquid 5～10s, and steel piece surface i.e. hangs last layer silvery white

Aluminum；

4) Diffusional aluminizing: the purpose of Diffusional aluminizing is to make hot dipping aluminum component, at high temperature. aluminum atom spreads to intrinsic silicon, because austenite is bigger than ferritic diffusion coefficient. so diffusion temperature is selected in more than AC point, carbon steel optional 950～10OO ~ C, it is incubated 4～6h.