Surface treatment method and coating method for steel material, and method for producing machine component
AssigneesKomatsu Ltd., Cotec Corporation, Nippon Kazai Co., Ltd.
InventorsHaruji Morita, Tsuneo Tate, Akira Shiozawa
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Abstract
This surface treatment method comprises a rustproofing step, a rinsing step, and a cleaning step. In the rustproofing step, a rustproofing liquid containing orthophosphoric acid and an organic acid is used to perform a rustproofing treatment on the surface of a steel material. In the rinsing step, a treatment liquid containing an oxo acid salt of a transition metal is used to perform a rinsing treatment on the surface of the steel material. In the cleaning step, the surface of the steel material that has undergone the rinsing step is subjected to a cleaning treatment.
Claims13
A surface treatment method for a steel material, comprising:
- a rustproofing step of using a rustproofing liquid containing orthophosphoric acid and an organic acid to perform a rustproofing treatment on a surface of a steel material;
- a rinsing step of using a treatment liquid containing an oxo acid salt of a transition metal to perform a rinsing treatment on the surface of the steel material;
- and
- a cleaning step of subjecting the surface of the steel material that has undergone the rinsing step to a cleaning treatment,
- the treatment liquid used in the rinsing step consisting of an oxo acid salt of a transition metal and water having an electrical conductivity of 20 μS or less.
Dependencies are inferred from the claim text.