Surface treatment apparatus and surface treatment method

Patent metadata

Field	Value
Publication number	US-2019233944-A1
Application number	US-201716338050-A
Country	US
Kind code	A1
Filing date	Jun 12, 2017
Priority date	Oct 6, 2016
Publication date	Aug 1, 2019
Grant date	—

Abstract

A surface treatment apparatus includes a treatment vessel including a treatment space in which a metal component is disposed, a spray nozzle that supplies mist of a non-chromate conversion treatment liquid to the treatment space, and a circulation device that collects the non-chromate conversion treatment liquid from the treatment space and supplies the non-chromate conversion treatment liquid to the spray nozzle.

First claim

1 . A surface treatment apparatus comprising:
a treatment vessel including a treatment space in which a metal component is disposed; a single-fluid spray nozzle that supplies mist of a non-chromate conversion treatment liquid with an average droplet diameter of 70 [μm] or less to the treatment space; and a circulation device that collects the non-chromate conversion treatment liquid from the treatment space and supplies the non-chromate conversion treatment liquid to the spray nozzle.

2 . The surface treatment apparatus according to claim 1 , wherein an amount of non-chromate conversion treatment liquid that is held and circulates in a treatment liquid circulation system is 10 [L] or less per cubic meter [m 3 ] of the treatment space, the treatment liquid circulation system including the spray nozzle, the treatment vessel, and the circulation device.

3 . The surface treatment apparatus according to claim 1 , wherein an amount of non-chromate conversion treatment liquid to be supplied from the spray nozzle to the treatment space is 10 [L/min] or less per cubic meter [m 3 ] of the treatment space.

4 . The surface treatment apparatus according to claim 1 , wherein a mist concentration of the non-chromate conversion treatment liquid in the treatment space is 100 [mL] or more and 5000 [mL] or less per cubic meter [m 3 ] of the treatment space.

5 . The surface treatment apparatus according to claim 1 , wherein the circulation device includes a temperature control device that controls a temperature of the non-chromate conversion treatment liquid.

6 . The surface treatment apparatus according to claim 1 , further comprising a detector that detects a mist concentration of the non-chromate conversion treatment liquid in the treatment space, wherein
an amount of non-chromate conversion treatment liquid to be supplied from the spray nozzle is controlled based on a detection result from the detector.

7 . The surface treatment apparatus according to claim 1 , further comprising a suppressing device that suppresses leak of the non-chromate conversion treatment liquid from an opening provided at an upper part of the treatment vessel.

8 . The surface treatment apparatus according to claim 7 , wherein the suppressing device includes an opening/closing device,
the opening/closing device including:
a lid member capable of closing the opening, and
a switching mechanism capable of switching between an open state and a closed state of the lid member.

9 . The surface treatment apparatus according to claim 7 , further comprising a conveyance device that conveys the metal component into and from the treatment space through the opening.

10 . The surface treatment apparatus according to claim 1 , further comprising:
a cleaning liquid supply device that supplies a cleaning liquid for cleaning inside of the treatment vessel and inside of the circulation device when the non-chromate conversion treatment liquid is exchanged; and a waste liquid recovery device that collects a waste liquid including at least one of the non-chromate conversion treatment liquid and the cleaning liquid.

11 . A surface treatment method comprising:
performing a mist spraying treatment for supplying mist of a non-chromate conversion treatment liquid with an average droplet diameter of 70 [μm] or less from a single-fluid spray nozzle to a treatment space of a treatment vessel in which a metal component is disposed; and supplying, from the spray nozzle to the treatment space, the non-chromate conversion treatment liquid collected from the treatment space.

12 . The surface treatment method according to claim 11 , further comprising
performing a degreasing treatment and an oxide film removing treatment for the metal component before the mist spraying treatment, wherein the metal component is sequentially conveyed by a conveyance device into a degreasing vessel in which the degreasing treatment is performed, a deoxidizing treatment vessel in which the oxide film removing treatment is performed, and the treatment vessel in which the mist spraying treatment is performed.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Mikawa Hiroaki
• Nagayasu Hiromitsu
• Sugiyama Shigehiro
• Sato Takumi
• Kawasaki Kohei
• Takagi Yusuke

Classifications

• C23C22/00

  Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals · CPC title

• C23C22/76 Primary

  Applying the liquid by spraying · CPC title

• B05D1/02

  performed by spraying · CPC title

• C23C22/77

  Controlling or regulating of the coating process · CPC title

• B05D3/00

  Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials (successively applying liquids or other fluent materials B05D1/36; drying ovens F26B) · CPC title